BMW Cars 1999-06

Brake Light Switch

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The brake light switch is located at brake pedal. There are different styles of switches. If there is a single threaded body switch, the switch will need to be manually adjusted. If the body is not threaded, it only has to be adjusted once during installation. If there are 2 switches at the brake pedal, one threaded and one that is not, the non-threaded unit operates the brake lights and the threaded body switch is the test switch.

Adjustment



Non-Threaded Body
  1. Disconnect the wiring harness from the brake light switch.
  2.  
  3. Press the brake pedal and hold down. Pull the plunger and sleeve of the brake switch forward and pull the switch out of the holder.
  4.  
  5. Depress and hold the brake pedal down. Pull the sleeve and plunger to the full out position. Install in the holder and slowly release the brake pedal. This will automatically adjust the switch position.
  6.  
  7. Connect the harness plug.
  8.  

Threaded Body
  1. Remove the lower dashboard trim to access the brake light switch.
  2.  
  3. Pull the wire connectors off the switch.
  4.  
  5. Loosen the switch locknuts.
  6.  
  7. Adjust the switch to achieve 15 / 64 inches (6mm) distance from the pedal to the edge of the switch threads.
  8.  

Removal & Installation





Click image to see an enlarged view

Fig. The pedal height is measured from the bottom face of the pedal to the firewall. The brake switch adjustment is shown as "B"

Non-Threaded Body
  1. Disconnect the wiring harness from the brake light switch.
  2.  
  3. Press the brake pedal and hold down. Pull the plunger and sleeve of the brake switch forward and pull the switch out of the holder.
  4.  
  5. Depress and hold the brake pedal down. Pull the sleeve and plunger to the full out position. Install in the holder and slowly release the brake pedal. This will automatically adjust the switch position.
  6.  
  7. Connect the harness plug.
  8.  

Threaded Body
  1. Remove the lower dashboard trim to access the brake light switch.
  2.  
  3. Pull the wire connectors off the switch.
  4.  
  5. Loosen the switch locknuts and thread the switch out of the holder.
  6.  
  7. Install in reverse order. Adjust the switch to achieve 15 / 64 inches (6mm) distance from the pedal to the edge of the switch threads.
  8.  
  9. Connect the wires and install the trim.
  10.  

 
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