Service brakes, air: controls, pedals and linkagesRecall 89V-121 · GMC vehicles
GENERAL MOTORS CORP. recall 89V-121 covers 7 GMC vehicles for a service brakes, air: controls, pedals and linkages problem, reported to NHTSA on July 24, 1989.
Source: NHTSA recall 89V121000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
THE REAR AXLE RELAY VALVES (ONE PER AXLE) MAY NOT MEET BRAKE RELEASE TIMING REQUIREMENTS OF FMVSS 121.
The risk
THE REAR AXLE BRAKES MAY NOT RELEASE IN THE TIMESSPECIFIED BY FMVSS 121.
The fix
REPLACE THE NONCOMPLYING RELAY VALVES.
SYSTEM:REAR AXLE AIR BRAKE RELAY VALVES/FMVSS 121.VEHICLE DESCRIPTION:HEAVY DUTY TRUCKS.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
Vehicles in this recall
Built from September 1, 1987 to December 1, 1987. Not every vehicle in these model years is included; check by VIN.