Brake Proportioning/Combination Valve: Service and Repair

Combination Valve Replacement

Removal Procedure




1. Raise the vehicle and properly support it with safety stands. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Disconnect the electrical connector from the combination valve.
3. Disconnect the front and rear brake pipes from the combination valve.
4. Remove the bolt holding the combination valve to the frame.
5. Remove the combination valve.

Installation Procedure




1. Install the combination valve to the frame.

Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the bolt to the combination valve and the frame and tighten to 10 Nm (89 lb in).
3. Connect the front and rear brake pipes to the combination valve and tighten to 30 Nm (22 lb ft).
4. Connect the electrical connector to the combination valve.
5. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Manual) (Service and Repair)Hydraulic Brake System Bleeding (Pressure) (Service and Repair).