REAR BRAKE ADJUSTMENT ACCESS HOLE(PROCEDURE TO REMOVE PLUG)

BRAKE DRUM ADJUSTMENT HOLE PLUG REMOVAL (SERVICE PROCEDURE)

(Revised to add J and N carlines and an additional step to the service procedure)

VEHICLES AFFECTED: 1987 - 1988 A,J,N CARLINES ------------------

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 o'clock or on the right hand drum at 3:00 o'clock and set the park brake.

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

5. Drill four (4) 6 mm (1/4 inch) 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 (see part number on page 5C2-2 of the 1988 J/N Chassis Service Manual).

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.