1977 MOTOR COACH MC5B Recalls (2)

Campaign:

77V186000 on 10/11/1979

Component:

Service brakes, air:supply

Affected:

1,182

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.

Correction:

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

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.

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Campaign:

79V178000 on 10/11/1979

Component:

Service brakes, air

Manufactured:

01/31/1975 - 08/31/1977

Affected:

1,602

Defect:

Certain vehicles do not comply to federal motor vehicle safety standard no. 121, "air brake systems". the low air warning signal may not activate until service reservoir pressure is below 60 psi. also, the brake release time may exceed the required 0.55 seconds on the right hand front wheel.

Correction:

Dealer will adjust the pin switch to pressure to bring vehicles into compliance with federal motor vehicle safety standard no. 121.

Notes:

Vehicle description: buses, intercity.system: service brakes; low air warning signal.consequences of defect: air pressure may fall too low and vehicle operatorwould not be warned. resulting partial loss of braking capability could cause avehicle accident.

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