Brake Fluid Pressure Sensor/Switch: Service and Repair

1. Disconnect battery ground cable and depressurize hydraulic accumulator Depressurize hydraulic accumulator by depressing brake pedal a minimum of 25 times. A noticeable change in pedal resistance will be felt when accumulator is depressurized. Failure to depressurize accumulator may result in personal injury and/or damage to vehicle and painted surfaces.
2. Disconnect electrical connector from pressure switch.
3. Using pressure switch socket tool No. J-35804 or equivalent, remove pressure switch and O-ring.
4. Reverse procedure to install, noting the following:
a. Lubricate O-ring seal with clean brake fluid.
b. Torque pressure switch to 15 ft. lbs.
c. Turn ignition switch On. Allow system to pressurize. BRAKE lamp should go out within 30 seconds and pump motor should turn off within 40 seconds.
d. Inspect for leaks.