Brakes (Front) - Caliper Not Sliding Freely, Corrosion
Builetin: 92-5-4ADate: Oct. '92
Ref.No.: 92-301-5
Corp.Ref.No.: 135017R
SUBJECT:
FRONT DISC BRAKE CALIPER BOLT BORE CORROSION (REPLACE BOLT AND SLEEVE ASSEMBLY/BUSHINGS)
MODELS AFFECTED:
1990-92 SKYLARK
1990-91 LESABRE
1990 PARK AVENUE/ULTRA
THIS BULLETIN IS BEING REVISED TO CORRECT THE MODELS AFFECTED. THIS BULLETIN REPLACES NO. 92-5-4.
CONDITION:
Some of the above vehicles may experience a condition of a caliper not sliding freely or moving on the mounting bolts inward toward the center of the vehicle.
CAUSE:
This condition is due to corrosion in the caliper mounting bolt area (See Figure 1) caused by contaminates seeping past the mounting bolt rubber bushing.
CORRECTION:
Inspect the caliper suspension mounting bolts and sleeves for corrosion. Also, inspect the bushings for cuts, nicks and/or excessive wear. If damage to either part is found, replace with new parts.
IMPORTANT:
Do Not attempt to polish away corrosion from the bolt or sleeve assemblies.
Lubricate the bushing bore with silicone grease, contained in Bushing Kit, P/N 18017226 or equivalent and install bolt and sleeve assembly. The bolt and sleeve assembly should slide through the bushing without the use of mechanical assistance. If the force required to slide the bolt and sleeve exceeds hand assembly pressure, remove the bushings and inspect the mounting bores for corrosion.
* If bores show signs of corrosion, clean the bores with a one inch wheel cylinder honing brush.
IMPORTANT:
Replace rubber bushings with new parts contained in service kit, P/N 18017226 whenever they are removed from housing.
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
Labor Operation Number: T1781
Labor Time: 1.2 Hours
Trouble Code: 92