Tmc Recall 78V008000: Service Brakes, Air, Supply

NHTSA recall 78V008000 · announced January 16, 1978 · filed by Transit Manufacturing,inc · 527 units affected

The problem

THE INVOLVED VEHICLES MAY NOT COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "MODULATED EMERGENCY BRAKING". THE "O" RINGS IN THE SHUTTLE VALVE MAY DEVELOP SLIGHT LEAKS IN COLD WEATHER. IN ADDITION, NEOPRENE WASHERS USED ON THESE "O" RINGS MAY EVENTUALLY EXPAND OR PUCKER IN COLD CLIMATES, MAKING IT POSSIBLE FOR THE SHUTTLE PISTON TO BECOME TRAPPED BY THE INNER-CIRCUMFERENCES OF THE WASHERS. THIS WOULD FORCE THE EMERGENCY BRAKES TO THE "ON" POSITION AND WOULD PREVENT THEM FROM BEING RELEASED.

What to do

THE DEALER WILL REPLACE THE TWO NEOPRENE WASHERS WITH GLASS FILLED TEFLON WASHERS THAT WILL NOT BE AFFECTED BY COLD CLIMATES.

Official NHTSA recall notice →

Notes

VEHICLE DESCRIPTION: BUSES.SYSTEM: EMERGENCY BRAKES; SHUTTLE VALVE.CONSEQUENCES OF DEFECT: SHOULD THE EMERGENCY BRAKES BECOME LOCKED DURINGVEHICLE OPERATION, LOSS OF VEHICLE CONTROL AND AN ACCIDENT COULD RESULT.

Vehicles covered by this recall

• 1976 Tmc Mc8
• 1977 Tmc Mc8

Source: National Highway Traffic Safety Administration public recall data. This page reports official records and is not legal, medical, or repair advice.