Transport CanadaCritical
1975 GMC M9500Transport Canada Recall #1979131
The official notice
Defect
MEDIUM AND HEAVY DUTY TRUCKS EQUIPPED WITH EATON ANTI-LOCK AIR BRAKE SYSTEM. THE PISTON IN THE ANTI-LOCK RELAY VALVES MAY EXPAND WHEN EXPOSED TO CERTAIN FLUID CONTAMINATES WHICH MAY BE FOUND IN THE AIR BRAKE SYSTEM. EXPANDED PISTONS CAN STICK OR JAM IN THE VALVES AND PREVENT AIR DELIVERY TO THE BVRAKE CHAMBERS CAUSING A LOSS OF BRAKING POWER ON THE AFFECTED AXLE. THIS CONDITION WOULD RESULT IN LONGER STOPPING DISTANCES.
Safety Risk
No risk description available.
Remedy
No remedy description available.
254 vehicles affectedMfr ref: 9G09 9T10Updated June 10, 2026