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July 27, 2021 NHTSA CAMPAIGN NUMBER: 21V573000
Inoperative rear axle brakes can increase the distance required to stop, increasing the risk of a crash.
NHTSA Campaign Number: 21V573
Manufacturer Mack Trucks
, Inc.
Components SERVICE BRAKES, AIR
Potential Number of Units Affected 124
Summary
Mack Trucks, Inc. (Mack) is recalling certain 2021 Granite, LR, and TerraPro vehicles. The rear drive axle may have the incorrect type of brake cam installed, which could result in inoperative rear axle brakes.
Remedy
Dealers will inspect the brake cams, and incorrect brake cams will be replaced, along with brake shoes, hardware, and wheel seals, as necessary, free of charge. Owner notification letters were mailed on August 10, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack’s number for this recall is SC0427.
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.nhtsa.gov.
RECALL INFORMATION
(July, 2021)
Mack has determined that certain model year 2021 trucks equipped with Meritor drum brakes may have the incorrect brake cams installed on the rear most drive axle.
Mack Trucks has not received any complaints or reports of vehicle crashes because of this non-compliance.
To ensure that these vehicles are equipped with the correct brake cams an inspection will be required. The wheels and drums on the rear most axle will need to be removed to gain access to the brake cams for inspection. If the brake cams are found to be correct, (see inspection process below) reassemble the unit and no further action is required. If the brake cams are found to be incorrect, replacement of the brake cams, brake shoes, brake hardware, and wheel seals may be required.
VEHICLES AFFECTED
Certain Mack North America vehicles manufactured between June, 29, 2020 to September, 22, 2020.
VEHICLE QUANTITY
There are 124 vehicles affected by this recall (124 U.S., 0 Canada).
Repair Instructions
1. Secure vehicle for service.
2. Following IMPACT operation ID 5122-03-02-01, remove both brake drums from the rear most drive axle.
3. Using the images below, inspect both passenger and driver side, rear most axle brake cams to ensure proper brake cams are installed.
a. If inspection is OK proceed to step 12.
b. If inspection is NOK proceed to step 4.
4. Remove brake shoes and brake hardware.
a. Refer to Meritor Literature on Demand (โLODโ) for proper procedure. The proper Maintenance Manual 4 (โMM4โ) can be downloaded free of charge here: https://www.meritor.com/literature-on-demand
Correct manual title and picture shown for reference.
5. Remove the axle flange nuts and cones on the affected axle.
6. Remove the rear most axle shafts.
7. With axle shafts removed, follow hub removal procedure for PreSet Plus hubs in the Conmet service manual 10084476. Found here: https://conmet.com/literature/#wheelendlit
NOTE: The correct service manual is located under โService Manual for ALL Hub Applicationsโ.
8. Remove and replace the affected brake cams using the above Meritor MM4 from the Meritor LOD system.
9. Inspect the brake shoes, Drums, and Brake hardware for reuse. If any defects are found related to the incorrect brake cam being installed, replace with new components. Refer to IMPACT parts tab for current part numbers.
10. Reinstall the brake shoes and the brake hardware referencing the Meritor MM4 service manual.
11. Replace the wheel seal and install the drive hub according to specifications and procedures found in the ConMet service manual referenced above.
12. Complete the drum installation procedure found in IMPACT operation ID 5122-03-02-01.
13. Release the Vehicle for service.
SEOCONTENT-START
Date Number Release Page 07.2021 SC0427 01 1(5)
Rear Most Drive Axle Brake Cam Inspection
GR, LR, and TE
SAFETY RECALL
Mack Trucks Inc.
Greensboro, NC USA
Page 2 of 5
Mack Truck Inc.
Safety Recall Date 07.2021 Page 5 of 5
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
Primary Labor Code:
5143-06-02-01 Brake Camshaft, Checking
0.9
Additional Labor Code (if applicable):
5141-03-03-02 Brake Camshaft, Replacement (one driven Wheel) (Wheel and Brake Drum Removed)
0.9 (per wheel)
Causal Part
TDA2210C8323
Authorization Number
C6630
Note: Dealers 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 are subject to a Safety Recall are brought to your dealership for service, or taken into your dealership vehicle inventory, it is strongly recommended that every effort be made to perform the recall correction before the vehicle is sold or released to the owner.
**************************************************************************************************************
MACK TRUCKS
RECALL ALERT
Subject:
Recall Number: Date:
Safety Recall SC0427, Rear Rear Brake Insp SRA-M427
July 30, 2021
Applicable Markets: โU.S. Canada
Description
Mack has determined that certain model year 2021 trucks equipped with Meritor drum brakes may have the incorrect brake cams installed on the rear most drive axle. The rear rear axle brakes may be inoperative, which can result in increased stopping distances and potential risk of a vehicle crash.
The wheels and drums on the rear most axle will need to be removed to gain access to the brake cams for inspection. If the brake cams are found to be correct, reassemble the unit and no further action is required. If the brake cams are found to be incorrect, replacement of the brake cams, brake shoes, brake hardware, and wheel seals may be required.
Model and Model Years Affected
โข Certain Mack 2021 Granite, LR and TerraPro model vehicles; Build dates: June 29, 2020 through September 22, 2020.
Vehicle Quantities
โข 124 (all US)
Dealer Responsibilities
โข The National Traffic and Motor Vehicle Safety Act and Canadian Motor Vehicle Safety Act requires 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.
โข 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
โข Vehicle list will be posted on the Trucks Dealer Portal on July 30, 2021.
โข Owner notification letters will be released on or before August 27, 2021.
Contact
If you have questions or concerns about this recall, contact the Regulatory Affairs Department at vtna.regulatoryaffairs@volvo.com.
ยฉ 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.
SEOCONTENT-END
3 Affected Products
Vehicles
8 Associated Documents
Recall Quarterly Report #2, 2021-4
RCLQRT-21V573-3901.PDF 211.225KB
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Recall Quarterly Report #1, 2021-3
RCLQRT-21V573-5950.PDF 211.123KB
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Remedy Instructions and TSB
RCRIT-21V573-1882.pdf 379.186KB
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Recall Acknowledgement
RCAK-21V573-5011.pdf 646.081KB
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Defect Notice 573 Report
RCLRPT-21V573-3911.PDF 213.849KB
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Recall 573 Report- Amendment 2
RCLRPT-21V573-5558.PDF 214.33KB
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Manufacturer Notices(to Dealers,etc)
RCMN-21V573-4709.pdf 188.488KB
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Recall Quarterly Report #3, 2022-1
RCLQRT-21V573-9495.PDF 211.305KB
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Last update on 2025-04-17 / Affiliate links / Images from Amazon Product Advertising API
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