Vehicle recall 21V684000 · September 1, 2021
2020-2022 Mack MD
The cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedal.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
Do not drive affected vehicles until they are repaired. This is the manufacturer’s safety advisory for this recall.
- Summary
- Mack Trucks, Inc. (Mack) is recalling certain 2020-2022 Mack MD vehicles. The cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedal.
- Consequence
- An unsecured brake pedal can cause a loss of braking ability and increase the risk of a crash.
- Remedy
- Owners are advised to not drive their vehicles until the remedy has been performed. Dealers will inspect the cotter pin installation and repair it as necessary, free of charge. Owner notification letters were mailed on September 13, 2021. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0429.
- 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 details
- NHTSA campaign
- 21V684000
- Reported to NHTSA
- September 1, 2021
- Filed by
- Mack Trucks, Inc.
- Manufacturer campaign
- SC0429
- Owner notification
- September 13, 2021
- Vehicles potentially affected
- 2,823
- Initiated by
- the manufacturer
- Components
- Service brakes, hydraulic › Pedals and linkages
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.