Removal Procedure
- Apply the parking brake.
 
- Block the wheels.
 
- Drain all of the air reservoirs. Refer to 
Air Brake Reservoir Draining
 .
 
- Disconnect the wiring harness connector.
 
- Remove the trailer air brake stop lamp switch.
 
Installation Procedure
Notice: Refer to Fastener Notice in the Preface section.
- Install the trailer air brake stop lamp switch.
 
Tighten
Tighten the trailer air brake stop lamp switch to 7 N·m (62 lb in).
- Connect the wiring harness connector.
 
- Start the engine and build up the system air pressure.
 
- Test the brakes for proper operation.
 
- Remove the wheel blocks.