2008–2010 Mack Mru, 2019–2021 Mack TE, 2011–2019 Mack Terrapro (mru) and 1 other model Recall: A brake control valve air leak into the attached exhaust hose can create…
NHTSA campaign 21V953000 · Parking Brake · filed Dec 9, 2021 · verified Jul 30, 2026
The defect
Mack Trucks, Inc. (Mack) is recalling certain 2008-2019 TerraPro (MRU) and 2019-2022 TerraPro (TE) vehicles. A brake control valve air leak into the attached exhaust hose can create excessive back pressure, causing the parking brake to release unexpectedly.
The risk
The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will remove the exhaust tube and fitting from the valve, free of charge. Owner notification letters were mailed February 8, 2022. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0433.
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.
Affected vehicles
Related recalls
More Mack Mru recalls
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- 2010–2014 Mack Chu and 10 other models — Hazard warning lights may fail
- 2010–2015 Mack Leu and 2 other models — Condensation in the intake manifold may freeze during cold…
- 2014 Mack Mru and 1 other model — When the button is pressed to release the seat belt, the…
Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 21V953000 (manufacturer number SC0433). Data last verified Jul 30, 2026.