Recall 78V-008: 1976–1977 Tmc MC8

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.

The fix

The dealer will replace the two neoprene washers with glass filled teflon washers that will not be affected by cold climates.

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.

Recall details

Vehicles in this recall

Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.

Frequently asked questions

What is recall 78V-008?

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.

How is recall 78V-008 fixed?

The dealer will replace the two neoprene washers with glass filled teflon washers that will not be affected by cold climates.

Is the recall repair free?

Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.