Service brakes, hydraulic: power assist: vacuum (Chevrolet, Pontiac and BUICK and 2 more)
Vehicle recall 74V-027. NHTSA received GENERAL MOTORS CORP.’s report on Feb 15, 1974.
Watch and the shortlist are kept with a free account, on every device. Your watch list. NHTSA’s own record is on nhtsa.gov.
The short answer
NHTSA received GENERAL MOTORS CORP.’s report on Feb 15, 1974. Copied from NHTSA on Oct 28, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
The notice gives no hazard in a field of its own.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- NHTSA’s part: Service brakes, hydraulic: power assist: vacuum.
What should you do?
The notice gives no remedy in a field of its own.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- How to reach the firm: 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.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 1,218,387 vehicles potentially involved, across everything this recall names.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- Chevrolet Blazerand 1973 and 1974, before the model years listed here
- Chevrolet Monte Carloand 1973, before the model years listed here
- Chevrolet Camaroand 1973 and 1974, before the model years listed here
- Chevrolet Capriceand 1973, before the model years listed here
- Pontiac Lemansand 1973 and 1974, before the model years listed here
- Buick Centuryand 1973, before the model years listed here
- Oldsmobile Cutlassand 1973, before the model years listed here
- Chevrolet C10and 1973 and 1974, before the model years listed here
- Chevrolet K10and 1973 and 1974, before the model years listed here
- Chevrolet Novaand 1973 and 1974, before the model years listed here
- Chevrolet P10and 1973 and 1974, before the model years listed here
- Chevrolet G10and 1973 and 1974, before the model years listed here
- Chevrolet G20and 1973 and 1974, before the model years listed here
- GMC G2500and 1973, before the model years listed here
- Chevrolet Impalaand 1973 and 1974, before the model years listed here
- GMC P1500and 1973 and 1974, before the model years listed here
- GMC Sprintand 1973, before the model years listed here
- Chevrolet Belairand 1973 and 1974, before the model years listed here
- Buick Apolloand 1973 and 1974, before the model years listed here
- GMC C1500and 1973 and 1974, before the model years listed here
- Oldsmobile Omegaand 1973 and 1974, before the model years listed here
- GMC K1500and 1973 and 1974, before the model years listed here
- Pontiac Firebirdand 1973 and 1974, before the model years listed here
- Buick Regaland 1973, before the model years listed here
- GMC G1500and 1973 and 1974, before the model years listed here
- Chevrolet EL Caminoand 1973, before the model years listed here
- Pontiac Venturaand 1973 and 1974, before the model years listed here
- Chevrolet Biscayneand 1973 and 1974, before the model years listed here
Who is recalling it?
- Made by GENERAL MOTORS CORP..
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
What the record doesn’t say
- NHTSA’s recall file doesn’t say whether anyone was hurt.
- Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
- This recall names only model years before 2015, which have no pages here. Your VIN, at NHTSA, says which recalls are open on a vehicle.
- How many have been returned or fixed isn’t in the notice.
Hearth Record wrote these lines.
Sources
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National Highway Traffic Safety Administration, Recalls flat file before 2010 (FLAT_RCL_PRE_2010).
Released Oct 28, 2026 and checked Oct 28, 2026. Updated daily. Public domain (U.S. Government work).
Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 28, 2026.