2008–2022 Mack (4 models) Parking Brake Recall 21V953000 (Mack SC0433)
NHTSA recall 21V953000 (Mack recall SC0433) covers about 20,668 2008–2022 Mack (4 models) vehicles (parking brake), filed with NHTSA Dec 9, 2021. There is no do-not-drive or park-outside advisory.
Source: NHTSA campaign 21V953000 · Data as of Nov 6, 2026 · By CarWhere Research
What's recalled
Component: Parking brake
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.
The remedy and its status
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.
Status: NHTSA lists Feb 8, 2022 as the owner-notification date for this campaign.
Mack recall number SC0433
NHTSA lists the manufacturer's own recall number for 21V953000 as SC0433. Owner letters and dealer service departments often use this code, so a search for "SC0433 recall" refers to the same campaign.
Affected models and years
Models and model years NHTSA lists for this campaign. Not every vehicle of a listed model and year is included; check by VIN.
| Vehicle | Model years | More |
|---|---|---|
| Mack MRU | 2008–2010 | — |
| Mack TE | 2019–2021 | — |
| Mack Terrapro (mru) | 2011–2019 | — |
| Mack Terrapro (te) | 2022 | — |
Key dates
- Report filed with NHTSA
- Dec 9, 2021
- Owner notification
- Feb 8, 2022
- Recall initiated by
- NHTSA’s Office of Defects Investigation
- Filed by
- Mack Trucks, Inc.
Check your VIN for 21V953000
- Find the 17-character VIN on the driver-side dashboard (visible through the windshield), the door-jamb sticker, or your registration.
- Enter it in NHTSA's free VIN recall lookup. It shows every open recall on that exact vehicle, including this one if it applies and hasn't been repaired.
- If 21V953000 is open, call any Mack dealer's service department and give them the recall number (21V953000 or SC0433). The repair is free.
Not sure of the exact model or year? Decode it first with the free VIN decoder.
Frequently asked questions
What is recall 21V953000?
NHTSA recall 21V953000 (Mack recall SC0433) covers about 20,668 2008–2022 Mack (4 models) vehicles (parking brake), filed with NHTSA Dec 9, 2021. There is no do-not-drive or park-outside advisory. It covers certain 2008-2019 TerraPro (MRU) and 2019-2022 TerraPro (TE) vehicles.
Is it safe to drive a vehicle with recall 21V953000?
NHTSA's record for 21V953000 carries no do-not-drive or park-outside advisory. The risk NHTSA lists is: "The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash." Get the free repair as soon as it is available for your vehicle.
How do I know if my vehicle is affected by 21V953000?
Only a VIN lookup can tell you. Not every vehicle of the listed models and years is included, and repaired vehicles drop off. Enter your 17-character VIN in NHTSA's free recall lookup at nhtsa.gov/recalls, or ask any Mack dealer to check it.
What is the fix for recall 21V953000, and is it free?
NHTSA's record says: "Dealers will remove the exhaust tube and fitting from the valve, free of charge." NHTSA lists Feb 8, 2022 as the owner-notification date for this campaign. Safety-recall repairs are done free of charge at authorized dealers.
What is the Mack recall number for 21V953000?
NHTSA lists the manufacturer's own recall number as SC0433. Dealers and owner letters often use that code (SC0433) instead of the NHTSA campaign number 21V953000.
Sources and method
- NHTSA recall record for 21V953000, from NHTSA's public recall campaign database. Problem, risk and remedy text is NHTSA's own wording.
- "Vehicles affected" is NHTSA's potential-units-affected count for the whole campaign.
- Data as of Nov 6, 2026. NHTSA updates campaigns as manufacturers file amendments, so check the official record for the latest.
Related recalls
- 24V792000: 2020–2025 Mack (5 models) service brakes (Oct 23, 2024)
- 24V398000: 2025 Mack (3 models) steering (Jun 4, 2024)
- 22V401000: 2021–2022 Mack (6 models) steering (Jun 7, 2022)