Brake Proportioning/Combination Valve: Service and Repair
Proportioning Valve ReplacementRemoval Procedure
Caution: Refer to Brake Fluid Irritant Caution.
Brake Fluid Irritant Caution
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice.
Brake Fluid Effects on Paint and Electrical Components Notice
1. Remove the battery tray.
Important: Note the locations of the brake pipes in order to aid in installation.
2. Disconnect the 2 brake pipes (1) from the proportioning valve. Use bleeder valve caps or similar caps to plug the ends of the brake pipes in order to prevent brake fluid from draining out of the pipes and to avoid brake fluid contamination.
3. Disconnect the 4 brake pipes (2) from the proportioning valve. Use bleeder valve caps or similar caps to plug the ends of the brake pipes in order to prevent brake fluid from draining out of the pipes and to avoid brake fluid contamination.
4. Raise and support the vehicle on a suitable hoist. Refer to Vehicle Lifting.
Vehicle Lifting
5. Remove the left inner fender shield.
6. Remove the 2 proportioning valve bracket bolts and remove the proportioning valve assembly from the vehicle.
Installation Procedure
Notice: Refer to Fastener Notice in Service Precautions.
Fastener Notice
1. Install the proportioning valve assembly and the 2 proportioning valve bracket bolts.
- Tighten the 2 proportioning valve bracket bolts to 24 Nm (18 ft. lbs.).
2. Install the left inner fender shield.
3. Lower the vehicle.
Caution: Make sure brake pipes are correctly connected to brake pressure modulator valve. If brake pipes are switched by mistake, wheel lockup will occur and personal injury may result. The only two ways this condition can be detected are by using a Scan Tool or by doing an Antilock stop.
4. Remove the caps from the 4 brake pipes (2) and install the 4 brake pipes (2) to the proportioning valve.
Remove the caps from the 2 brake pipes (1) and install the 2 brake pipes 11) to the proportioning valve.
- Tighten all brake pipe fittings to 23 Nm (17 ft. lbs.).
5. Install the battery tray.
6. Bleed the brake system.