BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

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.

REMOVAL & INSTALLATION



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 lock nuts and thread the switch out of the holder.
  6.  
  7. Install in reverse order. Adjust the switch there is 0.236 inches (6mm) from the pedal to the edge of the switch threads.
  8.  
  9. Connect the wires and install the trim.
  10.  

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.  

ADJUSTMENT



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 lock nuts.
  6.  
  7. Adjust the switch there is 0.236 inches (6mm) from the pedal to the edge of the switch threads.
  8.  

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.  

 
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