Firebird V8-305 5.0L VIN E TBI (1989)
Vibration Damper: All Technical Service Bulletins
Disc Brakes (Rear) - Moaning Noise
Bulletin Number:
91-5-11
Reference Number:
135003
Publish Date:
5/91
Subject:
REAR DISC BRAKE MOAN (INSTALL DAMPER)
Models
Affected:
1989-91 FIREBIRD MODELS WITH J-65 (REAR DISC BRAKES)
Condition:
Moan-type noise from vehicles with J-65 (rear disc brakes). This moan is most likely to occur during slow speed turns or when backing up.
Cause:
Stick slip of rear friction material on rotor during light braking sets up sympathetic vibration (moan) of rear suspension and body structure components.
Correction:
To eliminate this moan noise, a damper has been added in production.
A kit, P/N 10198312** is available from GMSPO which includes 2 dampers, 2 bolts and 2 nuts. Install the dampers as shown in the following
Illustration.
1.
Install the bolt and nut on the park brake cable bracket, and torque the nut to 45 N-m (33 lbs.ft.).
2.
Attach the damper to the end of the bolt and torque to 45 N-m (33 lbs.ft.).
Also, the rear brake pads, P/N 10174840* should be replaced.
*
Parts are currently available from GMSPO.
** Parts are expected to be available on June 3, 1991. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP