Brake Fluid Pump: Service and Repair

It is mandatory that hydraulic pressure be discharged from the system before hydraulic pump motor removal. The hydraulic accumulator contains brake fluid under high pressure. Turn ignition to off and pump brake pedal a minimum of 20 times until an increase in pedal force is clearly felt to discharge system pressure.


Removal
1. Disconnect battery ground cable.
2. Remove high-pressure line and fitting from pump body. Then remove accumulator.
3. Disconnect electrical connector from pressure switch.
4. Disconnect electrical connector from pump motor as follows:
a. Pull back rubber boot covering connector.
b. Using thumb and forefinger on side of connector, pull back sleeve to release lock.
c. Remove connector.
5. Remove pump housing-to-hydraulic actuation assembly mounting bolt.
6. Remove pump housing assembly from hydraulic unit.
7. Remove spring clip securing low-pressure hose to hydraulic pump. Remove and clamp off low-pressure hose to prevent excess fluid loss.
8. Remove pressure switch from pump housing.
9. Pry out pump mounting insulators and tubes from pump body.


Installation
1. Install pump mounting tubes and insulators to pump housing.
2. Install pressure switch into pump housing. Ensure O-ring on pressure switch is in good condition.
3. Install low-pressure hose and retaining spring clip. Position pump onto hydraulic unit and tighten retaining bolt to 5.2-6.6 lb-ft.
4. Connect high-pressure line and fitting to pump body. Tighten M10 flare fitting to 9-11 lb-ft, M12 flare fitting to 11-13 lb-ft. Install accumulator.
5. Connect electrical connectors to pump and pressure switch. Ensure sealing boots are correctly installed. Top off brake fluid as needed.
6. Connect battery ground cable.
7. Turn ignition to Run and check For hydraulic leaks. Allow pump to run until it switches off.
8. Perform system brake bleeding procedures and check operation of anti-lock brake system.