MACK 2021 MACK LR Recall
Check Your Product
According to the National Highway Traffic Safety Administration (NHTSA)
Product
2021 MACK LR
Brand
MACK
Lot Codes / Batch Numbers
Not specified in NHTSA notice. Check official source for details.
Products Sold
Model Year 2021
Mack Trucks, Inc. is recalling certain 2021 MACK LR vehicles due to service brakes, air issues. Inoperative rear axle brakes can increase the distance required to stop, increasing the risk of a crash..
Summary derived from NHTSA notice
Reason for Recall
As stated by NHTSA
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.
Reported concern (NHTSA)
Inoperative rear axle brakes can increase the distance required to stop, increasing the risk of a crash.
Recommended Action
Per NHTSA guidance
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.
Verify this information on the official source
For complete details and official instructions, check the National Highway Traffic Safety Administration (NHTSA) directly.
View official NHTSA recall noticePage updated: Jan 10, 2026