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Vehicle Make / Model:     Model Year(s):
     BUICK / APOLLO     1973-1974
     BUICK / CENTURY     1973
     BUICK / REGAL     1973
     CHEVROLET / BELAIR     1973-1974
     CHEVROLET / BISCAYNE     1973-1974
     CHEVROLET / BLAZER     1973-1974
     CHEVROLET / C10     1973-1974
     CHEVROLET / CAMARO     1973-1974
     CHEVROLET / CAPRICE     1973
     CHEVROLET / EL CAMINO     1973
     CHEVROLET / G10     1973-1974
     CHEVROLET / G20     1973-1974
     CHEVROLET / IMPALA     1973-1974
     CHEVROLET / K10     1973-1974
     CHEVROLET / MONTE CARLO     1973
     CHEVROLET / NOVA     1973-1974
     CHEVROLET / P10     1973-1974
     GMC / C1500     1973-1974
     GMC / G1500     1973-1974
     GMC / G2500     1973
     GMC / K1500     1973-1974
     GMC / P1500     1973-1974
     GMC / SPRINT     1973
     OLDSMOBILE / CUTLASS     1973
     OLDSMOBILE / OMEGA     1973-1974
     PONTIAC / FIREBIRD     1973-1974
     PONTIAC / LEMANS     1973-1974
     PONTIAC / VENTURA     1973-1974
Manufacturer: GENERAL MOTORS CORP. Mfr's Report Date: FEB 11, 1974
NHTSA CAMPAIGN ID Number: 74V027000 NHTSA Action Number: N/A
Component: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
Potential Number of Units Affected: 1218387
Summary:
Consequence:
Remedy:
Notes:
 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.

 
 

 

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