BRAKE LAMP SWITCH ADJUSTMENT REVISED PROCEDURE

VEHICLES AFFECTED: 1988-89 C/K TRUCKS

THIS BULLETIN CANCELS AND REPLACES BULLETIN NUMBER 88-5-102, ALL COPIES OF WHICH SHOULD BE DISCARDED. A NEW ADJUSTMENT PROCEDURE IS PROVIDED.

The brake lamp switch adjustment procedure has been revised for the 1988-1989 C/K models. Additional studies have shown that the procedure described below will provide for greater accuracy of adjustment. Whenever the brake lamp switch requires adjustment, the following procedure should be used:

. Start Engine . Pull Lever (A) Rearward (Towards back of vehicle Against its Stop (Figure No. 1) . Depress Brake Pedal Fully . Release Lever and Brake Pedal.

IMPORTANT: The brake lamp switch harness should be connected prior to adjustment.

Other areas that may contribute to a misadjusted brake lamp switch are:

. A binding condition between the eyelet of the brake booster rod and its attachment pin at the pedal. . Pedal mounting bushings not properly lubricated.

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.