Brake Proportioning/Combination Valve: Service and Repair
Proportioning Valve ReplacementRemoval Procedure
Caution: Refer to Brake Fluid Irritant in Service Precautions.
Brake Fluid Irritant Caution
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components in Service Precautions.
Brake Fluid Effects on Paint and Electrical Components Notice
Important: Do not wash the proportioning valve in any cleaning solution. The internal components are pre-lubricated with a special grease.
1. Remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement.
2. Remove the proportioning valve caps (1).
3. Remove the O-rings (5).
4. Remove the springs (2).
5. Remove the proportioning valve pistons (3). Carefully use needle nose pliers so that you do not damage the piston stems.
6. Remove the proportioning valve seals (4) from the pistons.
7. Inspect the proportioning valve pistons for corrosion and deformation. Replace the valve pistons if necessary.
8. Clean all of the parts in clean, denatured alcohol.
9. Dry the parts with non-lubricated compressed air.
Installation Procedure
1. Lubricate the following parts with the silicone grease that is supplied in the repair kit:
- O-rings (5)
- Proportioning valve seals (4)
- Proportioning valve piston stems (3)
2. Install new seals on the proportioning valve pistons. Ensure that the lip seals face up toward the cap.
3. Install the proportioning valve pistons and the seals 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.
Notice: Refer to Fastener Notice in Service Precautions.
Fastener Notice
6. Install the proportioning valve caps (1) in the master cylinder body.
* Tighten the proportioning valve caps to 27 Nm (20 ft. lbs.).
7. Install the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement.
8. Bleed the brakes. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure)