BRAKE MASTER CYLINDER COVER LEAKAGE - NEW PARTS

MODELS: 1985-1986 M, G, AND P MODELS EQUIPPED WITH GASOLINE ENGINES

THIS BULLETIN CANCELS TRUCK SERVICE BULLETIN 86-T-183. ALL COPIES OF 86-T-183 SHOULD BE DESTROYED; THEY CONTAIN AN INCORRECT PART NUMBER.

In the event the brake master cylinder cover does not appear to be sealing properly, the cover should be inspected for the following:

o Bowed or deformed edges on the reservoir cover.

o Cracked reservoir cover.

o Unsnapped reservoir cover.

1. If any of these conditions are noted, the reservoir cover and diaphragm assembly should be removed and discarded.

Note: Clean the cover before removal to prevent dirt from entering the system.

2. Refill the reservoir with brake fluid, Delco Supreme II DOT-3, P/N 1052535, or equivalent.

3. Install kit, P/N 18014184, which includes a new cover and diaphragm assembly.

o Inspect diaphragm to assure that it is completely seated in cover.

o Make sure the cover and diaphragm assembly is firmly snapped to the reservoir.

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.