Brake Master Cylinder Cover - Leakage

CORPORATE NUMBER: 665003R NUMBER: 86-T-196

GROUP: 5-Brakes

IMPORTANT - All Service Personnel Should Read DATE: November, 1986


SUBJECT: BRAKE MASTER CYLINDER COVER LEAKAGE

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.

FIGURE NO. 1 - BRAKE MASTER CYLINDER ASSEMBLY:

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

^ Bowed or deformed edges on the reservoir cover.
^ Cracked reservoir cover.
^ 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 fluids Delco Supreme II DOT-3, P/N 1052535, or equivalent

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

^ Inspect diaphragm to assure that is is completely seated in cover.
^ Make sure the cover and diaphragm assembly is firmly snapped to the reservoir.