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NHTSA Campaign 77V119000

SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

Issued by GENERAL MOTORS CORP. · Reported Aug 10, 1977 · 1,232 vehicles affected

What's wrong

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.

Remedy

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.

Vehicles affected by this recall

Make Model Year Units
CHEVROLET C30 1977 1,232
GMC C30 1977 1,232

Source: NHTSA Campaign 77V119000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.