GM Full-Size Trucks 1980-1987 Repair Guide

Brake Light Switch

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ADJUSTMENT



See Figure 1

The design of the switch and valve mounting provides for automatic adjustment when the brake pedal is manually returned to its mechanical stop as follows:

  1. With brake pedal depressed, insert switch and/or valve assembly into tubular clip until switch body and/or valve assembly seats on the tube clip. Note that audible clicks can be heard as threaded portion of switch and valve are pushed through the clip toward the brake pedal.
  2.  
  3. Pull brake pedal fully rearward against pedal stop, until audible click sounds can no longer be heard. Switch and/or valve assembly will be move in tubular clip providing proper adjustment.
  4.  
  5. Release brake pedal, then repeat Step 2 to assure that no audible click sounds remain.
  6.  

Electrical contact should be made when the brake pedal is depressed 1.0-1.24 in. (25-31 mm) from its fully released position.



Click image to see an enlarged view

Fig. Fig. 1: Stoplight switch

REMOVAL & INSTALLATION



  1. Remove the clip and the electrical connector from the brake light switch and remove it from the brake pedal mounting bracket.
  2.  
  3. Reverse procedure to install.
  4.  

 
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