2009 Mack GU Recall: Parking Brake
NHTSA campaign 08V177000 · Parking Brake · filed Apr 17, 2008 · verified Jul 30, 2026
The defect
MACK IS RECALLING 66 MY 2009 GU TRUCKS EQUIPPED WITH BENDIX MV-3 DASH CONTROL VALVES. THE MOLDED VALVE BODY HAS AN INCORRECT CORE PIN IN THE INJECTION MOLD CAUSING THE VALVE BODY TO BE OVERSIZED IN THE DOUBLE CHECK VALVE AREA. THIS CONDITION CAN ALLOW THE RUBBER DOUBLE CHECK VALVE TO BECOME LODGED IN THE BODY OPENING UNDER CERTAIN CIRCUMSTANCES.
The risk
IF THE DOUBLE CHECK VALVE BECOMES LODGED, IN THE EVENT OF A PRIMARY RESERVOIR FAILURE, AIR PRESSURE CAN LEAK PAST THE LODGED DOUBLE CHECK VALVE THEREBY DEPLETING THE SECONDARY RESERVOIR, CAUSING REDUCED ABILITY FOR MODULATING THE SERVICE EMERGENCY BRAKES 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 INSPECT THE MV-3 DASH VALVE FOR THE PRODUCTION DATE CODE. VALVES IN THE AFFECTED PRODUCTION LOTS WILL BE REPLACED FREE OF CHARGE. THE RECALL BEGAN ON MAY 9, 2008. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-528-6586.
MACK TRUCKS RECALL NO. SC0339.CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.
Affected vehicles
Related recalls
More Mack GU recalls
- 2010–2014 Mack Chu and 10 other models — Hazard warning lights may fail
- 2007–2015 Mack Chu and 6 other models — Mack Trucks, Inc
- 2009 Mack GU and 2 other models — Control box may lose its electrical ground
- 2008–2011 Mack GU — Electrical System
- 2012 Mack Granite (gu) and 5 other models — Service Brakes, Air
Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 08V177000 (manufacturer number SC0339). Data last verified Jul 30, 2026.