Recalls › 77V186000

NHTSA recall 77V186000

Service brakes, air › Supply

Motor Coach MC5B and 2 more

Reported Oct 25, 19771,182 vehicles affectedMOTOR COACH IND., INC.

The defect

The involved vehicles do not conform to federal motor vehicle safety standard no. 121, "air brake systems". The two "o" rings that are supplied along with the new shuttle valves are of a buna "v" quality. These rings are fully functional in normal climate conditions, however, in extremely cold environments, slight leaks may develop. This valve acts as a seal between the cylinder heads of the shuttle valve and the piston. In time this seal may expand or "pucker up", making it possible for the shuttle to become trapped in an emergency braking situation.

The remedy

The dealer will replace all defective "o" rings with ones having extreme cold resistance properties.

Official recall at NHTSA ↗

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Vehicles in this recall

Motor Coach MC5B
197619771978
Motor Coach MC5C
197619771978
Motor Coach MC8
197619771978

Notes

Vehicle description: motor homes equipped with new shuttle valves.system: service brakes; air control valve.consequences of defect: in this event, the brakes once "on" will not releaseand loss of vehicle control and an accident could result.note: driver should be alerted to this condition by a flashing light, buzzer,and a low reading on the air gauge.