SC0458 – Insufficient Air Volume in Brake System – 2022-2024 Mack Granite

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MACK TRUCKS
SAFETY RECALL RT
© Mack Trucks, Inc. CONFIDENTIAL – For limited distribution only to circulation list above. This bulletin, and any information herein, is subject to change by Company without notice. For the most current and accurate information, always refer to Trucks Dealer Portal for the electronic version of this document.
Description
On certain vehicles, the air volume calculation for system air is 3% below the FMVSS 121 required “12 times the combined volume of all service brake chambers”. The risk is a vehicle crash that may result in personal injury. Vehicles will be recalled and additional air tank volume will be added to meet FMVSS 121 requirements..
Model and Model Years Affected
• Certain 2022-2024 Mack Granite vehicles manufactured August 18, 2021 through September 18, 2023.
Vehicle Quantities
• 10 vehicles (10 US) Dealer Responsibilities
• The National Traffic and Motor Vehicle Safety Act and Canadian Motor Vehicle Safety Act require dealers to ensure that all new and used vehicles are free of safety defects and comply with all relevant safety standards at the time of delivery to the consumer.
• Dealers should make their personnel aware of the safety recall. In the event that a dealer has a vehicle included in the safety recall in their inventory to be sold, the condition must be corrected before releasing it to a customer. Notification Release Schedule
• Vehicle list will be posted on the Trucks Dealer Portal February 21, 2024.
• Owner notification letters will be released on or before April 15, 2024. Contact
If you have questions or concerns about this recall, contact the Regulatory Affairs Department at vtna.regulatoryaffairs@volvo.com.
Subject: Safety Recall SC0458, Air Tank Volume
Recall Number: SRA-M458
Date: February 21, 2024
Applicable Markets: ☒U.S. ☐Canada ☐ Export

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 24V-122
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. FEB 19, 2024 NHTSA Recall No. : 24V-122 Manufacturer Recall No. : SC0458
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 10 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2022-2024 Mack Granite Vehicle Type :
Body Style :
Power Train : NR
Descriptive Information : The recall population was determined by those vehicles which had a calculation error in running the air volume requirement. 10 Mack Granite trucks MY 2022/2023/2024.
Production Dates : AUG 18, 2021 – SEP 18, 2023 VIN Range 1 : Begin : 1M2GR2NC3NM002517 End : 1M2GR4NCXRM005044 ✔ Not sequential Description of Noncompliance :
Description of the Noncompliance :
Air Volume calculation for system air is 3% below the “12 Times the combined volume of all service brake chambers” FMVSS 1 : 121 – Air brake systems FMVSS 2 : NR
Description of the Safety Risk : The risk is a vehicle crash that may result in personal injury
Description of the Cause : Air volume calculation incorrect when customer requested changes were made to vehicle. Identification of Any Warning NR
that can Occur :
Involved Components : Part 573 Safety Recall Report 24V-122 Page 2 Component Name 1 : No Specific Component
Component Description : This was a calculation error involving multiple components Component Part Number : This was a calculation error involving multiple components Supplier Identification : Component Manufacturer
Name : Mack Trucks
Address : 7825 National Service Rd.
Greensoboro North Carolina 27409-9667 Country : United States Chronology :
February 7, 2024 Product Safety is informed of a potential issue with air volume calculations in certain vehicles and an investigation is opened. February 14, 2024 Results of the investigation are presented to the Product Safety Committee which determines that a product noncompliance to FMVSS 121 exists. February 19, 2024 DIR Filed with NHTSA. There have been no accidents or injuries related to this issue, there have been no warranty claims, field reports or customer complaints associated with this issue. Description of Remedy :
Description of Remedy Program : Vehicles will be recalled and additional air tank volume will be added to
meet FMVSS 121 requirements. Reimbursement for the recall will be covered by the Manufacturer’s Reimbursement Plan on file with NHTSA How Remedy Component Differs from Recalled Component :
Identify How/When Recall Condition was Corrected in Production : New air tanks will be installed which will increase the volume of air to meet the requirements.
No trucks with this configuration are being built at this time Engineering specifications relative these vehicles have been updated. Recall Schedule : The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-122
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Description of Recall Schedule : Dealer notification will begin on February 23, 2024 and owner
notification will begin or before April 15, 2024.
Planned Dealer Notification Date : FEB 23, 2024 – FEB 23, 2024
Planned Owner Notification Date : APR 15, 2024 – APR 15, 2024
* NR – Not Reported

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Date Number Release Page 03.2024 SC0458 01 1(7)
Mack Air Tank Volume
GR
RECALL INFORMATION
(March 2024)
Mack Trucks has determined that on certain 2022 to 2024 model year Granite trucks, the air volume calculation for system air is 3% below the FMVSS 121 required “12 times the combined volume of all service brake chambers”. The risk is a vehicle crash that may result in personal injury.
Mack Trucks has not received warranty claims, field reports, or service reports because of this issue.
To ensure that these vehicles meet Mack’s stringent quality requirements, follow the instructions outlined below to add an additional air tank to increase overall volume and meet FMVSS 121 requirements.
VEHICLES AFFECTED
Certain Mack Granite vehicles manufactured between August 18, 2021, and September 18, 2023.
VEHICLE QUANTITY
There are 10 vehicles affected by this recall. (10 US)
SAFETY
RECALL
Mack Trucks Inc.
Greensboro, NC USA
Parts
Part Number Part Description Quantity
23675317
Air Tank
1
23038158
Drain Valve
1
21292190
Straps
2
60111757
M14 Screw
4
21292188
Bracket
2
990953
M14 Locknut
4
990949
M6 Locknut
4
991084
Swivel M22
1
991965
Elbow Fitting 3/8”
1
991061
Plug
1
992013
F-fitting
As Needed
60110453
Push to connect 3/8”
As Needed
60110388
Push to connect 1/2”
As Needed
Repair Instructions
1. Park the vehicle on level surface.
2. Apply the parking brake.
3. Place the gear level in neutral.
4. Install the wheel chocks.
5. Disconnect the cable from the negative terminal.
Safety Recall Date 03.2024 Page 3 of 7
6. The retrofit air tank will be installed on the right-hand side of the truck on the frame.
7. Begin by drilling four 15.5mm holes in the frame to mount the air tank brackets. Use the measurements below.
Safety Recall Date 03.2024 Page 4 of 7
8. Ensure the plug, swivel, and elbow fitting have been installed on the tank prior to mounting it to the frame.
9. Once drilled, install the brackets, air tank, and straps to the frame using appropriate hardware.
Safety Recall Date 03.2024 Page 5 of 7
10. Once installed, connect the airline from the lower tank to underframe tank on right-hand side.
11. Route the 3/8” airline from rack lower air tank to under frame tank. Airline can be clipped on airline bundle on the transmission crossmember.
12. Once installation is completed, check system for any leaks.
Safety Recall Date 03.2024 Page 6 of 7
13. Reconnect cable to negative terminal.
14. Remove wheel chocks.
15. Return vehicle to service.
Safety Recall Date 03.2024 Page 7 of 7
REIMBURSEMENT
This repair is covered by an authorized Safety Recall. Reimbursement is obtained through the normal claim handling process.
UCHP Reimbursement Claim Type (used only when uploading from the Dealer Business System)
40
Recall Status
Vehicle repaired per instructions
1-Modified per instructions Labor Codes
1720-16-09-01 Campaign, General (0.1 x 12)
1.2 hrs. Causal Part
23675317 Authorization Number
C0350
Note: Dealers or the designated representatives are to perform Safety Recall on all subject vehicles at no charge to the vehicle owner regardless of mileage, age of vehicle or ownership (original purchaser or subsequent purchasers). Whenever vehicles that are subject to a Safety Recall are brought to your dealership for service, it is strongly recommended that every effort be made to perform the recall correction before the vehicle is released to the owner.

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This Notice applies to your vehicle, see enclosed “Notice of Vehicle Recall”
DEAR MACK TRUCK OWNER:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Mack Trucks, Inc. has decided that a defect which relates to motor vehicle safety exists in c ertain
2022-2024 Mack Granite vehicles manufactured August 18, 2021 through September 18, 2023.
SAFETY DEFECT: On certain vehicles, the air volume calculation for system air is 3% below the
FMVSS 121 required “12 times the combined volume of all service brake
chambers”.
SAFETY RISK:
Insufficient air volume can reduce braking performance and increase the risk of
a crash.
There are no precautions you can take other than having your vehicle repaired
by a Mack service center. Vehicles will be inspected and additional air tank
volume will be added to meet FMVSS 121 requirements. Recall repairs will be
performed at no cost to you.
The time required to repair your vehicle is approximately 4 hours.
You should contact the nearest Mack Parts and Service Center and make an
appointment. You can locate the closest Mack Parts and Service Center by going
online to http://www.macktrucks.com/ and selecting “Dealer & Service
Locations” or by calling our toll-free number: 1-800-866-1177.
PRECAUTIONS YOU
CAN TAKE:
TIME REQUIRED
FOR THE REPAIR:
WHAT YOU SHOULD
DO:
SC0458_OWNER_LTR
February 2024
IMPORTANT SAFETY RECALL SC0458
NHTSA RECALL # 24V122
NOTICE REGARDING
LEASED VEHICLES:
If you are a Lessor of vehicles subject to this Notice, you have an obligation
under Federal Law to provide a copy of this Notice to all Lessees within 10 days
of your receipt of this Notice. Further, you must maintain a record, which
identifies the Lessee(s) to whom you send a copy of this letter, the date you send
this letter, and the Vehicle Identification Number(s) of the vehicle(s) that you
have leased to that lessee. For purposes of this Notice, the term Lessor means:
a person or entity that is the owner, as reflected on the vehicle’s title, of any five
or more leased vehicles (as defined in CFR Section 577.4), as of the date of
notification by the manufacturer of the existence of a safety- related defect or
non-compliance with a Federal Motor Vehicle Safety Standard in one or more
of the leased motor vehicles.
OWNER RECALL
RESPONSE CARD:
The enclosed “Notice of Vehicle Recall” identifies your vehicle. If you no
longer own the vehicle, please help us update our records by completing
the “Vehicle Disposition Record” portion of the enclosed postage-free
Notice of Mandatory Safety Campaign card and mailing it back to us.
ASSISTANCE/
COMPLAINTS:
PRE NOTIFICATION
REMEDIES:
If your vehicle has not been repaired within a reasonable time after
delivering it to a Mack Parts and Service Center, please contact:
Mack Trucks, Inc.
North American Certification and Compliance
P.O. Box 26115
Greensboro, NC 27402-6115
vtna.regulatoryaffairs@volvo.com
You may also submit complaints to the Administrator of the National
Highway Traffic Safety Administration (1200 New Jersey Avenue, S.E.,
Washington DC 20590 or call the toll-free Auto Safety Hot Line at 1-888-
327-4236 (TTY: 1-800-424-9153), or go to http://www.safercar.gov if
you believe that Mack has failed to remedy the defect without charge, or
has failed to remedy the vehicle within 60 days of the owners first tender
to obtain repair following the earliest time that parts are available.
If you have previously paid for repairs as a result of this issue, you may
be entitled to recovery of those expenses.
Submit copies of all documentation supporting your claim according to
the rules specified in the “General Plan for Reimbursement of Prenotification
Remedies” provided in this mailing.
We regret any inconvenience this may cause to your operation, but hope you will appreciate our sincere
efforts to demonstrate Mack’s commitment to provide our customers with the best possible product.
MACK TRUCKS, INC.

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