Power assist: vacuumRecall 74V-027 · Buick and Chevrolet vehicles
GENERAL MOTORS CORP. recall 74V-027 covers 1,218,387 Buick and Chevrolet vehicles for a power assist: vacuum problem, reported to NHTSA on February 15, 1974.
Source: NHTSA recall 74V027000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
The fix
The remedy has not been described yet.
OLDSMOBILE CAMPAIGN NO 74-C-5.BUICK CAMPAIGN NO 73-C-3.GMC TRUCK CAMPAIGNNO 74-C-06.CHEVROLET CAMPAIGN NO 74-C-11.PONTIAC CAMPAIGN NO 74-C-5.POSSIBILITY THAT THE SINGLE DIAPHRAGM BRAKE VACUUM POWER BOOSTER WAS ASSEMBLEDWITH DEMENSIONAL DESCREPANCIES IN THE VACUUM POWER BOOSTER HOUSING WHICH MAYREDUCE THE TORQUE REQUIRED TO UNLOCK THE FRONT HALF OF THE HOUSING FROM THEREAR HALF.IF THIS CONDITION EXISTS, THE LOW UNLOCKING TORQUE COUPLED WITHOTHER VARIATIONS IN THE ASSEMBLY MAY CAUSE HOUSING TO ROTATE AND DISENGAGE FROMTHE LOCKING TABS RESULTING IN SEPARATION OF THE TWO HALVES OF THE BOOSTER ANDCOMPLETE LOSS OF BRAKES.(CORRECT BY INSPECTING AND STAKING THE HOUSING AT TWOPOINTS TO PRECLUDE ROTATION OF THE HOUSING.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.