1977 GMC C30 Recall

Campaign:

77V119000 on 10/11/1979

Component:

Service brakes, hydraulic:power assist:vacuum

Affected:

1,232

Defect:

On the involved vehicles, the nuts which attach the brake master cylinder to the hydro-boost unit may have been over-tightened. this could have caused stripped threads and cracked attaching flanges. should these nuts fail, the parts may separate and loss of service brakes would result.

Correction:

Dealer will inspect for cracks in the attaching flanges; units with cracks present will be replaced. if no cracks are found, the studs will be removed and the holes drilled out. the unit will be reassembled using bolts and nuts in place of the existing studs.

Notes:

Vehicle description: light trucks.system: service brakes; master cylinder to hydro-boost unit attaching nuts.consequences of defect: loss of braking capability could occur without priorwarning and could cause loss of vehicle control and an accident.

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