GM Full-Size Trucks 1970-1979 Repair Guide

Brake Light Switch

Print

ADJUSTMENT



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. (25-31mm) from its fully released position.

REMOVAL & INSTALLATION



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Brake light switch mounting

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the clip and the electrical connector from the brake light switch and remove it from the brake pedal mounting bracket.
  4.  
  5. Installation is the reverse of the removal procedure.
  6.  

 
label.common.footer.alt.autozoneLogo