1977 TMC MC8 Recalls (2)

Campaign:

78V008000 on 10/11/1979

Component:

Service brakes, air:supply

Manufactured:

07/31/1976 - 09/30/1977

Affected:

527

Defect:

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.

Correction:

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.

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Campaign:

79V188000 on 10/11/1979

Component:

Service brakes, air

Manufactured:

12/31/1974 - 12/31/1976

Affected:

748

Defect:

The involved vehicles have the following non-compliances: the low air warning signal may not activate until the service reservoir pressure is below 60 psi. in addition, the brake release time may exceed 0.55 seconds at the right front wheel, which constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air brake systems".

Correction:

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

Notes:

Vehicle description: buses, intercity.system: service brakes; brake system.consequences of defect: air pressure may fall too low and vehicle operatorwould not be warned. resulting partial loss of braking action could cause lossof vehicle control and an accident. slow brake release time would also affectbraking performance and could lead to an accident.

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