Recall 21V573 affects 124 2021 Mack Lr, Granite (Gr), and Te vehicles for incorrect rear brake cams. Repair is free at any franchised Mack dealer.
Mack is recalling 124 2021 Lr, Granite (Gr), and Te vehicles because an incorrect rear drive axle brake cam can leave the rear axle brakes inoperative. That brake failure can lengthen stopping distance and increase crash risk; Mack dealers will complete the recall repair free of charge.
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What's wrong?
The S-cam brake on the 2021 Mack Lr, Granite (Gr), and Te is part of the truck's air brake system. It is an S-shaped shaft inside the drum brake assembly. When air pressure applies the brakes, the S-cam turns and pushes the brake shoes outward so they press against the drum and slow the rear drive axle.
On affected trucks, the rear drive axle can have the wrong type of S-cam installed, or the S-cams can be reversed. Mack traced the problem to offline repair work after production that was not completed correctly. With the wrong cam in place, the rear axle brakes can fail to apply as designed, leaving those brakes inoperative.
There is no warning sign before failure. The issue is in the brake hardware, so an owner is not expected to hear, smell, or feel a clear early symptom before the rear axle brakes stop working.
Who's affected?
Covers the Lr, Granite (Gr), and Te from the 2021 model year, all using the same S-Cam brake component.
| 2021 Mack Lr | brake system |
|---|---|
| 2021 Mack Granite (Gr) | brake system |
| 2021 Mack Te | brake system |
| Units affected | 124 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not confirm inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Inoperative rear axle brakes increase stopping distance and raise the risk of a crash. Until the recall is handled, drive cautiously, leave extra following distance, and schedule the recall repair soon. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2021 Mack Lr, Granite (Gr), or Te is included in this recall.
- Contact a franchised Mack dealer to schedule the free brake-cam inspection and replacement that fixes the risk of inoperative rear axle brakes.
- Bring the recall notice if you have it. Reference recall number 21V573 and Mack recall SC0427 when you call.
- Drive cautiously until the repair is complete. Avoid hard braking and leave extra stopping distance.
What happens at the repair
At the dealer, a Mack technician inspects the rear drive axle brake cams. If the wrong brake cams are installed, the technician replaces them and also replaces the brake shoes, hardware, and wheel seals as needed. The recall repair is free, including parts and labor. Mack used its standard reimbursement plan for this campaign, so documented out-of-pocket repairs tied to this brake cam issue are eligible for review. Bring prior repair paperwork to the service desk or contact Mack customer service for the submission process.
| Reimbursement | Reimbursement available |
|---|
Timeline
| July 27, 2021 | NHTSA published the recall |
|---|---|
| July 30, 2021 | Dealer notification began |
| July 30, 2021 | Dealer notification ended |
| August 10, 2021 | Owner notification mailed |
| August 27, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V573?
Recall 21V573 covers 124 2021 Mack Lr, Granite (Gr), and Te vehicles with rear drive axle brake cams that can be the wrong type, which can leave the rear axle brakes inoperative. Mack dealers will inspect the brake cams and replace the affected parts for free.
What should I do if my 2021 Mack Lr, Granite (Gr), or Te is on this recall?
Check your VIN to confirm your specific truck is included in recall 21V573. If it is, contact a franchised Mack dealer to schedule the brake cam inspection. Reference recall number 21V573 or Mack recall SC0427 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack says dealers will inspect the brake cams and replace incorrect brake cams, brake shoes, hardware, and wheel seals as necessary free of charge.
What is the safety risk?
The safety risk is longer stopping distance from inoperative rear axle brakes. Mack's filing says the wrong rear drive axle brake cam can prevent the rear axle brakes from working, increasing crash risk. If your VIN is included, schedule the free dealer inspection and repair.
When were Mack owners notified about recall 21V573?
Mack mailed owner notification letters on August 10, 2021. If you bought the vehicle used or never received the letter, the VIN still decides whether the recall applies. Check your VIN, then contact a franchised Mack dealer or Mack customer service at 1-800-866-1177.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V573000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 21V573 |
| NHTSA recall # (full) | 21V573000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →