FRT. DISC BRAKE BOLT CORROSION (REPLACE BOLT & SLEEVE ASSY.)

SUBJECT: FRONT DISC BRAKE CAPIPER BOLT BORE CORROSION

MODELS AFFECTED: 1990 DE VILLES AND FLEETWOODS

Some 1990 DeVilles and Fleetwoods may experience a condition of a caliper not sliding freely or moving on the mounting bolts inward toward the center of the vehicle. This condition is due to corrosion in the caliper mounting bolt area (refer to Figure 1) caused by contaminates seeping past the mounting bolt rubber bushing. 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, 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.

o 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.

For warranty purposes use Labor Operation T1781 at 1.2 hours.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.