CLICKING 'SHOE SLAP' R. BRAKES (REPLACE BRAKE DRUMS)

SUBJECT: CLICKING NOISE "SHOE SLAP" FROM REAR BRAKES (REPLACE BRAKE DRUMS)

VEHICLES AFFECTED: 1992 "B" CAR WITH RPO JA2 BRAKES CHEVROLET CAPRICE BUICK ROADMASTER

CONDITION:

---------- Some owners of 1992 B-car sedans with JA2 brakes may comment on a "clicking" type noise coming from the rear brakes during apply.

CAUSE:

------ Improper machining creates a "thread like" pattern on the drum braking surface which causes the brake shoes to move out in the drum and then "click or slap" back on the backing plate.

CORRECTION:

----------- As of the following VIN breakpoints, a new brake drum was released for production on all sedans with JA2 brakes. This drum has a revised surface finish to reduce "shoe slap" on drum brakes. If a vehicle is found with this condition, REPLACE BOTH brake drums with the new P/N 1244646.

Arlington: Chevrolet Caprice - 1G1BN53E3NR133409 Buick Roadmaster - 1G4BN537XNR460328

Willow Run: Chevrolet - 1G1BN53E2NW136468

For vehicles repaired under warranty use:

Labor Operation: H-0207 Labor Time: 0.5 Hour

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.