Safety Recall NHTSA · 21V953000 Reported December 9, 2021

Parking brake may release unexpectedly

Q: What is recall 21V953000?

NHTSA recall 21V953000 was issued by Mack Trucks, Inc. on December 9, 2021. It addresses: Parking brake may release unexpectedly. The recall affects approximately 20,668 vehicles , with the defect involving the N/A component.

Q: Is my vehicle included in this recall?

The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls . NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.

Q: How long do I have to get a recall repair done?

There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.

Mack Trucks, Inc. · N/A · 20,668 vehicles potentially affected

NHTSA ID

21V953000

Manufacturer Campaign

SC0433

Manufacturer

Mack Trucks, Inc.

Component

N/A

Vehicles Affected

20,668

Recall Type

Vehicle

Report Received

December 9, 2021

Completion Rate

61.22

Defect Summary

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.

Safety Consequence

The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash.

Corrective Action

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.

What you should do

Look up your VIN at nhtsa.gov/recalls to confirm this recall applies to your vehicle.
Contact an authorized Mack Trucks, Inc. dealer and reference recall ID 21V953000 or campaign SC0433.
Schedule the free repair. By federal law, the manufacturer must remedy the defect at no cost.

View Official NHTSA Notice →

Similar Recalls

Other recalls from Mack Trucks, Inc. or involving N/A.

Recall 78V222000

Mack Trucks, Inc.

Electrical system:wiring

Electrical System · 161 affected · Oct 11, 1978

Recall 26V290000

Chrysler (fca Us, Llc)

Power transfer unit may fail and cause a loss of drive power

N/A · 61,711 affected · May 7, 2026

Recall 73V092000

Harley-davidson Motor Company

Brakes:mechanical service:other

N/A · 2,607 affected · Apr 30, 1973

Recall 73V094000

Harley-davidson Motor Company

Suspension

N/A · 11,705 affected · Apr 30, 1973

Recall 26V261000

Mack Trucks, Inc.

Rear brake modulators may short circuit

Service Brakes, Air · 2,354 affected · Apr 23, 2026

FAQ: Recall 21V953000

Your rights, the repair process, and what each field on this page means.

What is recall 21V953000?

NHTSA recall 21V953000 was issued by Mack Trucks, Inc. on December 9, 2021. It addresses: Parking brake may release unexpectedly. The recall affects approximately 20,668 vehicles, with the defect involving the N/A component.

How do I get this recall repaired?

Contact any authorized Mack Trucks, Inc. dealer and reference NHTSA recall ID 21V953000 or the manufacturer campaign number SC0433. Under federal law, the repair is completely free regardless of vehicle age or owner history.

Is my vehicle included in this recall?

The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls. NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.

How long do I have to get a recall repair done?

There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.

Where does the data on this page come from?

All information on this page is sourced directly from the U.S. Department of Transportation public dataset for NHTSA recalls. Last refreshed: 2026-05-22. For the most current official notice, visit nhtsa.gov/recalls.