Brake Fluid Pressure Sensor/Switch: Service and Repair

WARNING
- When carrying out any work on the brake system's hydraulic circuits the system must first be depressurized.
- Depress the brake pedal about 20 times or until noticeable resistance is felt in the pedal.
- Before starting any work on the pressure switch, thoroughly clean the area adjacent to it so that the risk of dirt getting into the brake system is eliminated.

Removal
1. Remove the damping rubber on the pressure pipe.
2. Unplug the connector from the pressure switch.
3. Install an extension piece on special tool (16) 89 96 571 and unscrew the pressure switch.

NOTE: If the pressure switch is tightened down hard, a suitable counter stay can be placed between the pump body and the hydraulic unit.

Installation





1. Install a new 0-ring and screw in the pressure switch.
- Tighten to: 23 Nm (17 ft lb)
2. Plug the electrical connector into the pressure switch.
3. Install the damping rubber on the pressure pipe.
4. Switch on the ignition and check that the brake and Antilock Brake System (ABS) warning lamps go out.
5. Check that there are no leaks in the brake system.
6. Drive the car on test to check that the brake system is in perfect working order.