Brake Proportioning/Combination Valve: Service and Repair

REMOVAL PROCEDURE

IMPORTANT: Do not wash the proportioning valve in any cleaning solution. The internal components are prelubricated with a special grease.

1. Remove the ABS hydraulic modulator/master cylinder.
2. Remove the master cylinder reservoir.





3. Remove the proportioning valve caps (1).
4. Remove the O-rings (5).
5. Remove the springs (2).
6. Remove the proportioning valve pistons (3). Carefully use needle nose pliers. Do not damage the piston stems.
7. Remove the proportioning valve seals (4) from the pistons (3).
8. Inspect the proportioning valve pistons (3) for corrosion and deformation. Replace the valve pistons (3) if necessary.
9. Clean all of the parts in clean, denatured alcohol.
10. Dry the parts. Use non-lubricated compressed air.

INSTALLATION PROCEDURE





1. Lubricate the following parts. Use the silicone grease that is supplied in the repair kit:
- New O-rings (5)
- New proportioning valve seals (4)
- Proportioning valve piston stems
2. Install new seals (4) on the proportioning valve pistons (3). Ensure that the seal lips face upward toward the cap.
3. Install the proportioning valve pistons (3) and the seals (4) in the master cylinder body.
4. Install the springs (2) in the master cylinder body.
5. Install new O-rings (5) in the grooves in the proportioning valve caps (1).

NOTICE: Refer to Fastener Notice in Service Precautions.

6. Install the proportioning valve caps (1) in the master cylinder body.
- Tighten the proportioning valve caps (1) to 27 Nm (20 ft lbs).

7. Install the master cylinder reservoir.
8. Install the ABS hydraulic modulator/master cylinder.