Lights - Adjustment For Brake Lamp Switch

89chevy04

GMC NUMBER: 89-T-32


GROUP: 5 - Brakes

DATE: March, 1989

CORPORATE
NUMBER: 965001
SUBJECT: BRAKE LAMP SWITCH ADJUSTMENT

MODELS: 1988-89 C/K TRUCKS


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

FIGURE 1 - STOPLAMP SWITCH:

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 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.

For stop lamp switch adjustment on vehicles under warranty, use:
Labor Op: N2440
Labor Time: .2 Hr