Caution: Refer to Brake Fluid Irritant Caution in the Preface section.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.

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.

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: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

6. Install the proportioning valve caps (1) in the master cylinder body.

Tighten
Tighten the proportioning valve caps to 27 N·m (20 lb ft).

7. Install the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement .
8. Bleed the brakes. Refer to Hydraulic Brake System Bleeding .