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NHTSA Campaign 85V124000

PARKING BRAKE:DRIVELINE:AIR:CHAMBER

Issued by GENERAL MOTORS CORP. · Reported Oct 7, 1985 · 4,870 vehicles affected

What's wrong

THE REAR BRAKE RELEASE TIME MAY BE GREATER THAN THE TIME SPECIFIED IN FMVSS 121, "AIR BRAKE SYSTEM". IN ADDITION, SOME TRACTORS MAY HAVE WARPED PARKING BRAKE APPLY SPRINGS WHICH ALSO EFFECT THE REAR BRAKE RELEASE TIME. CONSEQUENCE OF DEFECT: TRACTORS FAIL TO MEET THE STOPPING DISTANCE SPECIFIED IN FMVSS 121 WHICH IS REQUIRED TO STOP THE TRUCK SAFELY.

Remedy

INSTALL A QUICK RELEASE VALVE IN THE TRAILER SERVICE AIR LINE AND INCREASE THE DIAMETER OF THE REAR SERVICE BRAKE LINE. ALSO INSPECT REAR SPRING BRAKE CHAMBER AND RELEASE IF NECESSARY.

Vehicles affected by this recall

Make Model Year Units
CHEVROLET ASTRO 1983 4,870
CHEVROLET ASTRO 1984 4,870
CHEVROLET ASTRO 1985 4,870

Source: NHTSA Campaign 85V124000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.