BRAKE LAMP SWITCH ADJUST REVISED PROCEDURE

MODELS: 1988-89 C/K TRUCKS

THIS BULLETIN CANCELS AND REPLACES GMC TRUCK SERVICE BULLETIN NUM- BER 88-T-48, ALL COPIES OF WHICH SHOULD BE DISCARDED. A NEW ADJUSTMENT PROCEDURE IS PROVIDED.

The brake lamp switch adjustment procedure has been revised for the 1988-89 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 1)

Depress Brake Pedal Fully

Release Lever and Brake Pedal

IMPORTANT: The brake lamp switch harness should be connected prior to adjust- ment.

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.

For stop lamp switch adjustment on vehicles under warranty, use:

Labor Op: N2440 Labor Time: .2 Hr

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.