May 24, 2019 NHTSA CAMPAIGN NUMBER: 19V391000
Left, Rear Brake Caliper may Drag
A dragging brake reduces the ability to stop or slow down a vehicle, which increases the risk of crash. A dragging brake may cause thermal damage to the brake components, which may activate the ABS warning light. The warning light may cause the driver to immediately stop the vehicle and transfer occupants, which increases their risk of injury.
NHTSA Campaign Number: 19V391
Manufacturer Blue Bird Body Company
Components SERVICE BRAKES, AIR
Potential Number of Units Affected 4,218
Summary
Blue Bird Body Company (Blue Bird) is recalling certain 2015-2020 Vision and All American school buses equipped with Bendix
ADB22X air brakes. The driver side rear brakes may drag.
Remedy
Blue Bird will notify owners, and dealers will install a new caliper with an updated clearance adjustment mechanism, free of charge. Blue Bird issued owners interim notification on July 18, 2019. The recall began August 28, 2019. Owners may contact Blue Bird customer service at 1-478-822-2242. Blue Bird’s number for this recall is R19AA – SB.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
R19AA
IMPORTANT SAFETY RECALL NOTICE
NHTSA Recall Number: 19V-391 School Bus
NHTSA Recall Number: 19V-393 Non-School Bus
DATE: August 28, 2019
Dear Blue Bird Owner:
SUBJECT: R19AA, Bendix ADB22X LH Rear Caliper
This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.
This important safety recall notice applies to your bus(es) identified by both Blue Bird Body Number and Vehicle Identification Number (VIN) on the enclosed yellow cover sheet. If you no longer own the subject bus(es), please complete the appropriate section of the yellow cover sheet and return to Blue Bird in the enclosed pink postage prepaid envelope.
Blue Bird Body Company and Bendix Spicer Foundation Brake, LLC are recalling certain model year 2015-2020 Vision and All American school buses manufactured from November 15, 2013 through April 10, 2019, and certain model year 2015-2020 Vision and All American non-school buses manufactured from July 30, 2014 through March 28, 2019. The ADB22X air disc brake on the left (driver’s side) rear corner of the bus may experience an unintended reduction in the gap between the brake pad and rotor (running clearance) during operation. This can lead to a dragging brake and/or a melted wheel speed sensor. In the context of this safety recall, dragging brake is defined as a brake that has zero gap between the pad and the rotor (running clearance) – with no pressure applied by the driver – until the pad wears and re-establishes the gap between the pad and the rotor. This condition results from the brake product’s prior generation adjustment mechanism design. Due to the direction of wheel rotation, the left rear adjustment mechanism is more susceptible to unintended adjustment. Even though a school bus has air disc brakes on all four-vehicle wheel-ends, the brake application on the rear axle is of longer duration and has a different pattern of apply and release. The rapid release of high brake forces may cause an unintended adjustment, which may decrease running clearance and can contribute to a dragging brake (as defined earlier) and/or could lead to a melted wheel speed sensor.
If the gap between the brake pad and rotor is eliminated, it may lead to high temperatures at the wheel end. The left rear ABS sensor wire may become damaged due to high temperatures and set an ABS fault which illuminates the ABS dash warning light. The high temperatures may lead to the presence of smoke, smoke odor, or potential for fire, which could result in school bus emergency evacuation procedures in uncontrolled traffic situations. Either condition increases the risk of injury.
To correct this issue, Bendix will provide replacement kits for left rear ADB22X calipers on applicable buses. The kit will contain a new caliper with an updated clearance adjustment mechanism and necessary hardware to install the caliper assembly. The remedy component has an updated clearance adjustment mechanism that is internal to the ADB22X assembly. The kits will be installed through an authorized location at no cost to the vehicle owner. Parts will be available September 3, 2019.
Administering the Recall:
Bendix is administering the recall for Blue Bird® bus owners. Quantify the number of vehicles impacted by the recall then submit a request to Bendix at 22XSBcampaign@bendix.com including the quantity needed, a contact name, and a delivery address. To obtain a recall remedy kit, owners must submit a Part Request Form, as indicated below.
Obtaining a Remedy Kit:
Visit the Product Action Center within the Services and Support section of Bendix’s website at https://www.bendix.com/en/servicessupport/recallcenter/recallcenter_1.jsp on bendix.com to down- load the Bendix ADB22XSB Part Request Form (BW7622). Complete the appropriate form electronically– saving the completed form onto your computer – or print and complete. Ensure that all of the required information is provided.
Submit the completed Part Request Form to Bendix in one of two ways:
- Email all documents to 22XSBcampaign@bendix.com (preferred method); or,
- Send via U.S. Mail/Canadian Post to:
Bendix Commercial Vehicle Systems, LLC
Attention: ADB22X Campaign
901 Cleveland Street
Elyria, OH 44035
Labor Reimbursement:
Blue Bird will reimburse the labor cost of the repairs related to this recall at no cost to you the vehicle owner. The Standard Repair Time (SRT) to accomplish these repairs is outlined below:
- R19AA Inspection: SRT Time .20 hours
- R19AA Repair: SRT Time 1.50 hours
Please return the replaced caliper core – in the packaging from the recall remedy kit – to Bendix within 60 days.
Returning the Caliper Core:
- Returning 1 – 2 Cores:
Package the caliper cores in the packaging from the recall remedy kits. Include a copy of the claim form associated with each caliper along with the shipment. Re-box the caliper cores and return them to Bendix via UPS using Account Number 2AT516.
- Returning 3 or More Cores:
Palletize the caliper cores for shipment. Include a copy of the claim form associated with each caliper along with the shipment. Download and complete the Return Shipment Information Form from the Product Action Center within the Services & Support section of the Bendix website at https://www.bendix.com/en/servicessupport/recallcenter/recallcenter_1.jsp Contact Central Transport at (586) 467-1900 to coordinate a pick up. All return shipments will be at no expense to the shipper.
How to Contact Bendix:
Please telephone the Bendix Recall Assistance Center, at 1-800-478-1793, with any questions you may have about this safety recall campaign. Representatives are available Monday through Friday, 8:00 a.m. through 5:00 p.m. ET for your convenience. You may also e-mail the recall center any time at 22XSBcampaign@bendix.com
If you have in your possession or have sold a bus that was purchased from another dealer that may be affected by this recall, please notify me at 478-822-2242 or [email protected]
Federal law requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
If the modifications directed by this notification were performed on your bus prior to the receipt of this recall notification, attach a copy of the work order/invoice. Mail the documents in the pink self- addressed postage prepaid envelope included with the pink reply sheet to Blue Bird for warranty consideration. Reimbursements will be made in accordance with the requirements of the National Highway Transportation Safety Act, Title 49 Code of Federal Regulations, Parts 573 and 577.
If Blue Bird Body Company should fail to or is unable to remedy this condition without charge to you, you may contact:
ADMINISTRATOR
NATIONAL HIGHWAY TRAFFIC SAFETY
ADMINISTRATION 1200 NEW JERSEY AVENUE, SE
WASHINGTON, D.C. 20590
Or, you may call The National Highway Traffic Safety Administration toll free at: 1-888-327-4236 TTY 1-800-424-9153 or go to: https://www.safercar.gov
Questions regarding this recall campaign should be directed to your local Blue Bird Dealer.
BLUE BIRD BODY COMPANY
3920 Arkwright Road, Suite 200, Macon, GA 31210 – (478) 825-2021
R19AA
IMPORTANT SAFETY RECALL NOTICE
NHTSA Recall Number: 19V-391 School Bus
NHTSA Recall Number: 19V-393 Non-School Bus
| DATE: | August 28, 2019 |
| TO: | U.S. DEALERS |
| SUBJECT: | R19AA, Bendix ADB22X LH Rear Caliper |
This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.
This important safety recall notice applies to your buses identified by both Blue Bird Body Number and Vehicle Identification Number (VIN) on the enclosed yellow cover sheet.
Blue Bird Body Company and Bendix Spicer Foundation Brake, LLC are recalling certain model year 20152020 Vision and All American school buses manufactured from November 15, 2013 through April 10, 2019, and certain model year 2015-2020 Vision and All American non-school buses manufactured from July 30, 2014 through March 28, 2019. The ADB22X air disc brake on the left (driver’s side) rear corner of the bus may experience an unintended reduction in the gap between the brake pad and rotor (running clearance) during operation. This can lead to a dragging brake and/or a melted wheel speed sensor. In the context of this safety recall, dragging brake is defined as a brake that has zero gap between the pad and the rotor (running clearance) – with no pressure applied by the driver – until the pad wears and re-establishes the gap between the pad and the rotor. This condition results from the brake product’s prior generation adjustment mechanism design. Due to the direction of wheel rotation, the left rear adjustment mechanism is more susceptible to unintended adjustment. Even though a school bus has air disc brakes on all four-vehicle wheel-ends, the brake application on the rear axle is of longer duration and has a different pattern of apply and release. The rapid release of high brake forces may cause an unintended adjustment, which may decrease running clearance and can contribute to a dragging brake (as defined earlier) and/or could lead to a melted wheel speed sensor.
If the gap between the brake pad and rotor is eliminated, it may lead to high temperatures at the wheel end. The left rear ABS sensor wire may become damaged due to high temperatures and set an ABS fault which illuminates the ABS dash warning light. The high temperatures may lead to the presence of smoke, smoke odor, or a potential for fire, which could result in school bus emergency evacuation procedures in uncontrolled traffic situations. Either condition increases the risk of injury.
To correct this issue, Bendix will provide replacement kits for left rear ADB22X calipers on applicable buses. The kit will contain a new caliper with an updated clearance adjustment mechanism and necessary hardware to install the caliper assembly. The remedy component has an updated clearance adjustment mechanism that is internal to the ADB22X assembly. The kits will be installed through an authorized location at no cost to the vehicle owner. Parts will be available September 3, 2019.
Administering the Recall:
Bendix is administering the recall for Blue Bird® bus owners. Quantify the number of vehicles impacted by the recall then submit a request to Bendix at 22XSBcampaign@bendix.com including the quantity needed, a contact name, and a delivery address. To obtain a recall remedy kit, owners must submit a Part Request Form, as indicated below.
Obtaining a Remedy Kit:
Visit the Product Action Center within the Services and Support section of Bendix’s website at https://www.bendix.com/en/servicessupport/recallcenter/recallcenter_1.jsp on bendix.com to download the Bendix ADB22XSB Part Request Form (BW7622). Complete the appropriate form electronically – saving the completed form onto your computer – or print and complete. Ensure that all of the required information is provided.
Submit the completed Part Request Form to Bendix in one of two ways:
- Email all documents to 22XSBcampaign@bendix.com (preferred method); or,
- Send via U.S. Mail/Canadian Post to:
Bendix Commercial Vehicle Systems, LLC
Attention: ADB22X Campaign
901 Cleveland Street
Elyria, OH 44035
Labor Reimbursement:
Blue Bird will reimburse the labor cost of the repairs related to this recall at no cost to you the Dealer or to the vehicle owner. The Standard Repair Time (SRT) to accomplish these repairs is outlined below:
- R19AA Inspection: SRT Time .20 hours
- R19AA Repair: SRT Time 1.50 hours
Please return the replaced caliper core – in the packaging from the recall remedy kit – to Bendix within 60 days.
Returning the Caliper Core:
- Returning 1 – 2 Cores:
Package the caliper cores in the packaging from the recall remedy kits. Include a copy of the claim form associated with each caliper along with the shipment. Re-box the caliper cores and return them to Bendix via UPS using Account Number 2AT516.
- Returning 3 or More Cores:
Palletize the caliper cores for shipment. Include a copy of the claim form associated with each caliper along with the shipment. Download and complete the Return Shipment Information Form from the Product Action Center within the Services & Support section of the Bendix website at https://www.bendix.com/en/servicessupport/recallcenter/recallcenter_1.jsp Contact Central Transport at (586) 467-1900 to coordinate a pick up. All return shipments will be at no expense to the shipper.
How to Contact Bendix:
Please telephone the Bendix Recall Assistance Center, at 1-800-478-1793, with any questions you may have about this safety recall campaign. Representatives are available Monday through Friday, 8:00 a.m. through 5:00 p.m. ET for your convenience. You may also e-mail the recall center any time at 22XSBcampaign@bendix.com
If Blue Bird’s records indicate bus(es) subject to this recall were delivered in your service area, a list of affected bus(es) will be enclosed. The bus(es) will be identified by Blue Bird Body Number and Vehicle Identification Number (VIN) on the enclosed yellow cover sheet. Dealers should verify correct owners and assure that complete mailing and shipping addresses are provided for each listed owner.
It is the dealer’s responsibility to verify that the correct owner name, address, and telephone number is provided for each listed vehicle. Any corrections or updates should be made in ClaimsCenter. Addresses that cannot be updated should be forwarded to the Recall Administrator.
Federal law requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
Dealers are reminded of their responsibilities under Section 154 of The National Traffic and Motor Vehicle Safety Act of 1991. Dealers are required to complete modifications on units in their inventory before delivering to the final owner. Reference Blue Bird Body Company Distributor Memo No. 42-92.
If you have in your possession or have sold a bus that was purchased from another dealer that may be affected by this recall, please notify me at 478-822-2242 or [email protected]
Sincerely,
Lisa Hancock
Corporate Recall Administrator
Blue Bird Corporation
402 Blue Bird Blvd, Fort Valley, Georgia 31030
Phone 478.822.2242 [email protected]
BLUE BIRD BODY COMPANY
3920 Arkwright Road, Suite 200, Macon, GA 31210 – (478) 825-2021
SEOCONTENT-START
1
Kits are vehicle/application specific.
Do not install this kit unless it is for the intended application.
Figure 1 – Bendix® ADB22X™ Air Disc Brake Recall Repair Kit
GENERAL
This instruction sheet is intended to provide the necessary information to service the Bendix® ADB22X™ Air Disc Brake caliper/carrier assembly in connection with recall campaign number 19E030. This campaign applies only to ADB22X brake assemblies that were manufactured between January 01, 2009 and November 27, 2018, inclusive and are installed on the left (driver’s side) rear axle of a school bus. This kit contains the components shown in Figure 1.All of the kit contents must be used for the installation.Do not reuse the removed hardware (Items 2 through 4).R19AA – BENDIX® ADB22X™ AIR DISC BRAKE RECALL REPAIR KIT
Kit Contents
Item No.
Description
Qty.
1
Caliper/Carrier Assembly
1
2
Mounting Bolts
6
3
Washers (Axial Style Only)
6
4
Chamber Mounting Nuts
2
2
3
4
Label Location
Bendix® ADB22X™ Air Disc Brake
Axial Style
Bendix ADB22X Air Disc Brake
Vertical Style
2
4
Caliper
Carrier
Spring Brake Chamber
Carrier
Recall Kit Part Numbers
Part No.
Application
K191727
Axial Caliper Kit, Blue Bird®
1
2
GENERAL
SAFETY GUIDELINESWARNING! PLEASE READ ANDFOLLOW THESE INSTRUCTIONSTO AVOID PERSONAL INJURY OR DEATH:When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES: Park the vehicle on a level surface, apply the parking brakes and always block the wheels. Always wear personal protection equipment. Stop the engine and remove the ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically-charged components. Do not attempt to install, remove, disassemble or assemble a component until you have read, and thoroughly understand, the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools. If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with a Bendix® AD-IS® air dryer system, a Bendix® DRM™ dryer reservoir module, or a Bendix® AD-9si® air dryer, be sure to drain the purge reservoir. Following the vehicle manufacturer’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle. Never exceed manufacturer’s recommended pressures. Never connect or disconnect a hose or line containing pressure; it may whip and/or cause hazardous airborne dust and dirt particles. Wear eye protection. Slowly open connections with care, and verify that no pressure is present. Never remove a component or plug unless you are certain all system pressure has been depleted. Use only genuine Bendix® brand replacement parts, components and kits. Replacement hardware, tubing, hose, fi ttings, wiring, etc. must be of equivalent size, type and strength as original equipment and be designed specifi cally for such applications and systems. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifi cally stated and approved by the vehicle and component manufacturer. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. For vehicles with Automatic Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving. The power MUST be temporarily disconnected from the radar sensor whenever any tests USING A DYNAMOMETER are conducted on a vehicle equipped with a Bendix® Wingman® system. You should consult the vehicle manufacturer’s operating and service manuals, and any related literature, in conjunction with the Guidelines above.
VEHICLE PREPARATION
1.Follow the General Safety Guidelines included onthis page. Park the vehicle (by other means than thefoundation brakes) on level ground and chock thewheels.
2.Drain all reservoirs to 0 psi (0 kPa).
3.Clean the exterior of the Bendix® ADB22X™ Air DiscBrake assembly.
3
Figure 2 – Bendix® ADB22X™ Air Disc Brake Identification Label
4. Verify the caliper/carrier is a part of the recall campaign
by checking for a green paint dot in the location shown
in Figure 2. This green dot indicates that the Bendix®
ADB22X™ Air Disc Brake caliper/carrier was already
replaced as a part of the recall campaign.
5. If a green dot is not visible, look for the part number
label on the caliper as shown in Figure 2. This may
require the removal of paint and road debris to clearly
identify the brake assembly. Go to the Identification
Label section for interpretation of the identification label.
IDENTIFICATION LABEL
The identification label contains the part number, brake
model, serialized production code, and, in some cases a
customer part number. See Figure 2 for the interpretation
of the identification label.
1. Verify the model number on the tag is ADB22X. If the
model is not ADB22X this brake assembly is not affected
by this recall. Note that the Bendix® ADB22X™-LT and
ADB22X™-V Air Disc Brakes are not a part of this recall.
2. Verify the date of manufacture is between Jan. 1, 2009
and Nov. 27, 2018, inclusive. If the date of manufacture
is not within this time frame the brake assembly is not
covered by this recall.
Note: X represents a placeholder for alpha
and numeric characters.
Month – A through M
Skipping I
Shift of
Manufacture
(Optional)
Year
09 through 18
Manufacturing
Plant
Day of Month
01 through 31
Work Team
Number
(Optional)
Production
Line
_1 A 01 09 BG L SSS
Shift
Number
Interpreting the Serialized Production Code
The serialized production code is on the identification label that is located on the caliper casting in the fixed pin area.
See Figure 1 on page 1. Locate the serialized production code – removing the paint coating, if necessary – to read
the code. Disregard the Work Team Number, Shift of Manufacture, Manufacturing Plant, Production Line, and Shift
Number codes shown in the gray boxes below. The portion of the serialized production code that determines the date
of manufacture is highlighted and can be interpreted as follows:
• The first field is the month (A = January, B = February, etc. – excluding the letter I – so that
J = September, and so on);
• The next two fields are the day of the month (e.g. 01 = 1st); and
• The next two fields are the year (e.g. 18 = 2018).
Bendix® ADB22X™ Air Disc Brakes included in
this field action were manufactured during the
following time period:
Jan. 01, 2009 through Nov. 27, 2018
That is, A 01 09BG through L 27 18BG
Bendix Model
Number
(Either Location)
Customer
Part Number
Identification Label
XXXXXXX ADB22X
ADB22X
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
Bendix Part
Number
Serialized
Production Code
Green Paint
Dot Location
New Caliper/Carrier
(Not covered by this recall)
Label
Location
4
DISASSEMBLY
CAUTION: Follow all safe maintenance practices, including those listed on page 2 of this document. Park the vehicle (by other means than the foundation brakes) on level ground and chock the wheels.
CAUTION: When using a hoist to support the air disc brake, do not attempt to use the pad retainer bar as a bracing point. It is not designed to support the weight of the brake. Instead, use a brace (or chain) wrapped around the entire brake to attach the hoist.
SPRING OR SERVICE BRAKE CAGING & REMOVAL
Use the spring brake manufacturer’s recommended safety practices in all cases.
Some spring brake and vehicle manufacturers permit caging the spring brake while the spring brake is engaged.
BENDIX® BRAND PISTON-STYLE ACTUATORS
1. With the vehicle on a level surface and the wheels properly chocked, apply air to release the spring brakes (parking brakes) by using the dash-mounted air control valve. Back out the release bolt (See Figure 3, arrow “A”), using a maximum torque of 26 ft-lbs (35 Nm) to cage the air released spring force on the pushrod.
A
Figure 3 – Actuator Spring Caging and Removal
2. Exhaust the air from the spring brake chambers by using the dash-mounted air control valve. While supporting the chamber in position, remove and discard the brake chamber mounting nuts (Item 4) (See Figure 3). Mark the orientation of the chamber to the mounting bracket for remounting. Remove the spring brake chamber. If it becomes necessary to disconnect the air hoses to the chamber, with all air pressure drained from the system, mark the hoses for reconnection and then disconnect the hoses from the chamber.
Figure 4 – Pad Replacement
Brake Pad Holder Spring
Brake Pad
Brake Pad Retainer Bar
Retainer Pin
Washer
Spring Clip
Shear Adapter
Adjuster
Cap
Inboard
Outboard
Cable Protection Plate
Cable Guide (2 alternate designs used)
Cable to Electrical Supply
Sensor
Sensor
Electrical Wear Sensor
(if equipped)
4
4
5
BRAKE PAD REMOVAL
1. If the air disc brake is equipped with an electronic wear sensor indicator (See top of Figure 4), remove and retain the cable protection plate and its mounting hardware. Note the position of the sensors in the brake pad channels, and carefully remove them. In most cases it is not necessary to release the cable connector in order to move the sensors away from the pad installation work area. Inspect the wear sensors – replace if damaged or abraded.
2. (See Figure 4). While pressing down against the brake pad retaining bar, remove the spring clip, washer, and retainer pin and brake pad retainer bar.
3. Remove and retain the pad shield (if equipped). (See Figure 5).
4. Follow the steps in the Adjuster Mechanism section for backing-off the adjuster mechanism. Slide the caliper inboard then outboard to permit easy removal of the brake pads. Remove and retain the brake pads.
Brake Pad Retainer Bar
Retainer Pin
Washer
Spring Clip
Pad Shield
Figure 5 – Pad Shield
ADJUSTER MECHANISM
1. With the spring brake released (or caged), remove the adjuster cap using the tab, taking care not to move the shear adapter. Note: One of two styles of adjuster cap (stamped metal or plastic adjuster cap) may be used.
Adjuster Cap
LocationFigure 6 – Adjuster Cap Location
Shear AdapterAdjusterCapTab
TabCap
Figure 7 – Exploded View of Adjuster and Adapter
Figure 8 – Cap Installed: Tab Location
2. For illustration purposes, the exploded view (Figure 7) shows the adjuster and shear adapter separated. When using the adjuster mechanism, always have the shear adapter installed on the adjuster.
3. Using a 10 mm six-point box wrench, turn the shear adapter counterclockwise and listen for the sound of three clicks as the mechanism backs-off (increases) the running clearance. Note: Do not use an open-ended wrench as this may damage the adapter.
CAUTION:
Never turn the adjuster without the shear adapter installed. The shear adapter is a safety feature and is designed to prevent excessive torque from being applied to the adjuster. The shear adapter will fail (by breaking) if too much torque is applied.
6
Caliper/Carrier Assembly
(Actuator Not Shown)
Anchor Plate/
Torque Plate
Mounting Bolts (Qty. 6)
Figure 10 – Axial Mount Caliper/Carrier
CALIPER/CARRIER DISASSEMBLY
CAUTION: Follow all safe maintenance practices, including those listed on page 2 of this document. Park the vehicle (by other means than the foundation brakes) on level ground and chock the wheels.
CAUTION: When using a hoist to support the air disc brake, do not attempt to use the pad retainer bar as a bracing point. It is not designed to support the weight of the brake. Instead, use a brace (or chain) wrapped around the entire brake to attach the hoist.
Note that this instruction sheet covers both the vertical and axial mounting bolt styles. Go to the appropriate section for your application.
3
Mounting Bolts
(Qty. 6)
Washers not used in this
application.
Anchor Plate/
Torque Plate
Caliper/Carrier Assembly
(Showing Spring Brake Actuator)
Alignment Bushing
Alignment Bushing
Figure 9 – Vertical Mount Caliper/Carrier
2
2
Washers
(Qty. 6)
DISASSEMBLY – VERTICAL MOUNTING BOLT STYLE
1. (See Figure 9). Supporting the air disc brake by necessary means, remove and discard the six mounting bolts (Item 2). Lift the caliper up off the anchor plate. (See Figure 9).
2. The vertical bolt assembly includes an alignment bushing. This bushing must be saved for reuse during reassembly of the brake. The bushing mounts in the torque plate and maintains the correct alignment of the brake assembly relative to the rotor.
3. If the brake assembly does not separate from the anchor plate it may be helpful to install an M16 X 2.0 screw longer than 120 mm at the bushing locations and tap the end of the bolt with a hammer to free the brake assembly. Remove the caliper/carrier assembly.
DISASSEMBLY – AXIAL MOUNTING BOLT STYLE
1. (See Figure 10). Supporting the air disc brake by necessary means, remove and discard the six bolts (Item 2) and washers (Item 3) attaching the brake to the anchor plate and remove the caliper/carrier assembly from the vehicle.
7
CALIPER/CARRIER REINSTALLATION (BOTH STYLES)
1. Supporting the air disc brake by necessary means, attach the brake to the anchor plate using six bolts (Item 2) and, if included, washers (Item 3). Do not reuse the removed bolts and washers. Torque to the values shown in
Table 1.
SPRING OR SERVICE BRAKE REINSTALLATION
CAUTION: Do not use spring brake chambers with seals that have a thickness less than 0.12 in. (3 mm). Use only actuators which are recommended by the vehicle manufacturer.
1. Ensure the spring brake chamber mounting area is clean and free of any debris. (See B in Figure 11).
2. Position the spring brake chamber in the same orientation it was removed. Secure the chamber with the spring brake chamber mounting nuts (Item 4). See Figure 3. Alternately tighten both the nuts step-by-step up to a final torque of 133 ± 7 ft-lbs (180 ± 10 Nm). Do not reuse the nuts that were removed during the disassembly.
3. If the air hoses were disconnected, reconnect the air hoses as marked and be sure that each hose is not twisted or in contact with moving vehicle components. The air hose routing must allow for full caliper travel. Note that for spring brake service chambers the ports are indicated by: “11” Service Brake Port and “12” Spring Brake Port. (See Figure 12).
B
Figure 11 – Spring Brake Installation
Figure 12 – Port Designations
Note: If a new spring brake chamber is being installed, note that the chamber may contain drain plugs installed around the perimeter of the body. If drain plugs are present, after installation, remove whichever plug is at the lowest position. The selected drain hole must be aligned downwards (or within ±30°) when installed on the vehicle.
BRAKE PAD REPLACEMENT
Before installing the brake pads, use the adjuster to fully retract the tappets to provide adequate clearance.
Clean the surfaces that will come in contact with the brake pad.
Caution: When installing pads and retaining springs, where appropriate, use heavy duty gloves and always keep fingers away from potential pinch hazard areas.
1. Install the brake pad retaining springs onto the brake pads by inserting one end of the spring onto the lug at the top of the brake pad (See Figure 13). Carefully apply enough force to permit the second lug to fully engage, taking care to keep fingers etc. away from the spring as it seats.
2. Pull the caliper fully outward and install the outboard pad. Move the caliper fully inward and install the inboard pad.
3. To reinstall wear indicators (if used): Insert the wear sensors into position in the new brake pads. Route the sensor cable through the cable protection plate channel and secure the plate with the mounting hardware retained at disassembly. (See the Brake Pad Removal section.)
4. Push the pad retainer bar into the groove of the caliper. Press down on the pad retainer bar, and insert the pad retainer pin, with the pin pointing downwards, where possible. Install the washer and then the spring clip. (See Figure 4).
5. Using a 10 mm, six-point box wrench, turn the shear adapter clockwise until the pads contact the rotor. Note: Do not use an open-ended wrench as this may damage the adapter. (See Figure 14).
Brake Pad Spring
Brake Pad
Figure 13 – Pad Retaining Spring Installation
8
If the shear adapter fails, you may attempt a second time with a new (unused) shear adapter.
Note: Always double-check that the spring brake is released (where applicable) if a shear adapter fails; if this step was missed, the shear adapter will break off, and it may appear that the caliper is seized.
In cases where a second failure of the shear adapter confirms that the adjustment mechanism is seized, the caliper must be replaced.
6. Using the same tool, turn the shear adapter counterclockwise and listen for the sound of 3 clicks as the mechanism backs-off (increases) the running clearance. (See Figure 15).
7. Replace the adjuster cap.
8. Apply and release the brakes. The hub should turn easily by hand after applying and releasing the brake.
9. Recheck the running clearance. Readjust if necessary.
10. Reinstall the wheel, following the vehicle manual instructions.
The brake pads and rotor must be maintained within the recommended wear limits. Failure to monitor wear and replace the brake pads and rotor when required may result in diminished brake performance.
Figure 14 – Clockwise Rotation
Figure 15 – Counterclockwise rotation
Important: If replacing the pads with new pads Bendix strongly recommends that whenever brake pads are replaced, the complete axle set be replaced together to maintain optimal braking, Use only pads which are permitted by the vehicle manufacturer, axle manufacturer, and/or disc brake manufacturer. Failure to comply with this may invalidate the vehicle manufacturer’s warranty.
OPERATIONAL TEST
1. Before returning the vehicle to service, with the system pressurized, using a soap solution, check for air leakage. Minimal leakage in the area around the diaphragm is permitted (100 SCCM), and a one-inch bubble in one minute at the hose fitting is acceptable. If abnormal leakage is detected, the diaphragm must be replaced, or the fitting adjusted, respectively.
COMPLETION OF RECALL KIT INSTALLATION
After the installation of the caliper/carrier is complete, process the removed caliper/carrier per your normal core procedures.
If you have additional questions or concerns regarding this recall, contact the Bendix Tech Team at 1-800-AIR-BRAKE (1-800-247-2725), option 2.
9
Air Disc Brake Attachment Hardware
Vertical Mount
Fastener & Torque*
Sheer SleeveWashers are not usedon vertical-mounted ADB22X™ brake assembliesShort (floating) PinSheer SleeveService Actuators ShownRight-hand BrakeLeft-hand BrakeShelf
Thomas Built®
Mounting Bolts (Item 2): M16 x 2.0 x 110 mm, Class 12.9. Use the new fasteners included.
Washer (Item 3): None used.
Torque: Using the torque pattern below, pre-torque to between 40-50 ft-lbf
[54-68 N·m], with a final torque of 229 ft-lbf [310 N·m].
Left-Hand Brake Torque* Pattern (Viewed from Below)
Right-Hand Brake Torque* Pattern (Viewed from Below)
†ƒ„‚…Sheer sleeve above, in this location(view from below)Shelf above, in this locationBrake’s short (floating Pin) is this side
†ƒ„‚…Sheer sleeve above, in this location(view from below)Shelf above, in this locationBrake’s short (floating pin) is this side
Axial MountFastener & Torque*Anchor Plate/Torque PlateCaliper/Carrier Assembly (showing service actuator)Blue Bird® Mounting Bolts (Item 2): M20 x 50 mm Class 10.9. Torque: Pre-torque to 20-60 ft-lbf [27-81 N·m], with a final torque of 350-400 ft-lbf [475-542 N·m].Navistar® Mounting Bolts (Item 2): M20 x 60 mm Class 10.9. Torque: Pre-torque to 20-60 ft-lbf [27-81 N·m], with a final torque of 350-400 ft-lbf [475-542 N·m].Thomas BuiltMounting Bolts (Item 2): M20 x 60 mm Class 10.9. Torque: Pre-torque to 20-60 ft-lbf [27-81 N·m], with a final torque of375 ft-lbf [510 N·m].Washer (Item 3): Use the new mounting bolts and washers included. Torque* PatternAny cross-pattern, see the example below:‚ƒ„…†*Use the new fasteners included in the kit when installing the air disc brake caliper. Ensure that the brake caliper guide pins slide freely once the final torque has been achieved on all fasteners. Refer to the OE maintenance manuals for vehicle specific installation recommendations.
Table 1 – Torque Plate Fasteners and Torque Recommendations (see manufacturer’s recommendations)
3
2
10
S-1665 Rev. 000 © 2019 Bendix Spicer Foundation Brake LLC • 06/19 • All Rights ReservedLog-on and Learn from the BestOn-line training that’s available when you are 24/7/365.Visit brake-school.com.
12 Affected Products
Vehicles
| BLUE BIRD | ALL AMERICAN | 2015-2020 |
| BLUE BIRD | VISION | 2015-2020 |
9 Associated Documents
Defect Notice 573 Report
RCLRPT-19V391-9123.PDF 214.988KB
Recall Acknowledgement
ISSUED Renotification Notice
Remedy Instructions and TSB
RCRIT-19V391-3182.pdf 3434.444KB
ISSUED Owner Notification Letter(Part 577)
RCONL-19V391-1248.pdf 777.732KB
Manufacturer Notices(to Dealers,etc)
RCMN-19V391-5076.pdf 816.117KB
Recall Quarterly Report #1, 2019-3
RCLQRT-19V391-9109.PDF 211.137KB
Recall Quarterly Report #2, 2019-4
RCLQRT-19V391-8426.PDF 211.246KB
ISSUED Interim Owner Notification Letter(Part 577)
RIONL-19V391-5977.pdf 547.624KB
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