K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Brake Light Switch: All Technical Service Bulletins
Lights - Adjustment For Brake Lamp Switch
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
