Recalls for your 1977 Gmc C30

Recalls for 1977 Gmc C30

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DEFECT #1 - SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM


Posted on: 1979-10-12
Description
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.

Consequence


Corrective Action
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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