REAR BRAKE ADJUSTMENT ACCESS HOLE(PROCEDURE TO REMOVE PLUG)

MODELS AFFECTED: 1987-1988 CIMMARONS

Some rear brake drum adjusting hole plugs cannot be removed using a punch because of insufficient die piercing. On drums where a punch will not work, the hole plug can be removed using the following procedure:

1. Remove the rear wheel and reinstall two lug nuts backwards to hold drum in place against rear wheel bearing.

2. Locate an accessible adjusting hole plug (select a plug not covered with a balance weight).

3. Position the adjuster hole plug on the left hand drum at 10:00 or on the right hand drum at 3:00 and set the park brake.

4. Prick punch four spots within the hole plug outline.

5. Drill four 6mm (1/4") diameter holes within the hole plug outline.

6. File the hole opening as necessary to insert a brake adjusting tool.

7. Install rubber adjusting hole cover, P/N 5464803 or equivalent, into adjusting hole to prevent dirt or contamination from entering drum brake assembly.

For warranty purposes use Labor Operation T1318 at .3 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.