Hydraulic System: Service and Repair

Flushing Procedure

Important:
^ If evidence of contamination is present in the vehicle's brake fluid, flush the entire brake system using one of the procedures outlined below.
^ After flushing the entire brake system, replace the following rubber components.
- Brake hose assemblies
- Master cylinder rubber parts
- Brake caliper and wheel cylinder boots and seals
- Hydraulic modulator
- ABS solenoids
^ Re-flush the system after all of the rubber components have been replaced. Use one of the following procedures outlined below.
^ Once the second flushing procedure has been performed, bleed the entire system. Refer to Hydraulic Brake System Bleeding.
^ Flush the system if any of the following conditions exist:
^ There is a concern that the fluid is contaminated.
^ The fluid contains traces of mineral oil, engine oil, or transmission fluid.

Pressure Flush

^ Tools Required
- J 35589 Bleeder Adapter

Notice: Pressure Bleeding equipment can be used to perform the flush procedure. The pressure bleeding equipment used for flushing must be of the diaphragm type. It must a have a rubber diaphragm between the air supply and the brake fluid to prevent air, moisture, and other contaminants from entering the hydraulic system.

1. Clean the fluid reservoir cover and the surrounding areas.
2. Remove the fluid reservoir cover.
3. Remove any remaining brake fluid in the reservoir.
4. Refill the reservoir to the proper level using clean DOT-3 brake fluid.
5. Install the J 35589 to brake fluid reservoir.
6. Install the J 35589 to the pressure bleeding equipment.
7. Adjust the pressure bleeding equipment to 35 - 70 kPa (5 - 10 psi). Wait for approximately 30 seconds in order to ensure that there is no leakage.
8. Adjust the pressure bleeding equipment to 205 - 240 kPa (30 - 35 psi).
9. Attach a clear plastic hose to the rearward bleeder valve on the hydraulic modulator.
Place the other end of the hose in a container in order to collect the draining brake fluid. Do not submerge the hose end into the fluid.
10. Slowly open the bleeder valve. Allow the fluid to flow until clean brake fluid flows or until at least 118 ml (4 oz.) of fluid is accumulated.
11. Close the valve.
12. Attach a clear plastic hose to the forward bleeder valve on the hydraulic modulator. Place the other end of the hose in a container in order to collect the draining brake fluid. Do not submerge the hose end into the fluid.
13. Slowly open the bleeder valve. Allow the fluid to flow until clean brake fluid flows or until at least 118 ml (4 oz.) of fluid is accumulated.

Notice: Refer to Fastener Notice in Service Precautions.

14. Close the valve.

^ Tighten the hydraulic modulator bleeder valve to 9 Nm (80 inch lbs.).

15. Raise and support the vehicle. Refer to Vehicle Lifting.

Important: Flush the wheel brakes in the following sequence:
1. Right rear
2. Left rear
3. Right front
4. Left front

16. Attach the bleeder hose to the bleeder valve at each wheel. Place the other end of the hose into a container in order to collect the draining brake fluid. Do not submerge the hose end into the fluid.
17. Slowly open the bleeder valve and allow the fluid to flow.
18. Close the valve when the clean brake fluid begins to flow or at least 235 ml (8 oz.) of fluid is accumulated.
19. Lower the vehicle.
20. Remove the J 35589
21. Replace the following rubber components:
^ Brake hose assemblies
^ Master cylinder rubber parts
^ Brake caliper and wheel cylinder boots and seals Hydraulic modulator ABS solenoids
22. Repeat the entire pressure flushing procedure one more time.
23. Inspect the fluid level in the reservoir. Fill the reservoir to the correct level, if necessary.
24. Install the fluid reservoir cap.
25. Bleed the entire brake hydraulic system. Refer to Hydraulic Brake System Bleeding.