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How-to » Brakes » Hydraulic System » How to Replace a Proportioning Valve
 Note: This is a general guide for all vehicles.

How to Replace a Proportioning Valve

PARTS
  • Brake Fluid
  • Proportion Valve Switch
  • 1 more part
TOOLS
STEPS
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Moderate
Safety Tip:
Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or closed toe shoes.

1
Make sure the car is parked on a solid level surface to ensure that it does not roll or lean when raised.
2
Raise the front of the vehicle using a jack.
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3
Secure the vehicle with jack stands on both sides for safety before starting any work. Do not rely on the jack to hold the vehicle up while working.
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4
Locate the brake proportioning valve.
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5
Clean all surfaces of the proportioning valve using brake cleaner.
6
While an assistant presses and releases the brake pedal, inspect the proportioning valve for leaks.
7
Gain full access to the proportioning valve to remove it from the vehicle.
8
Disconnect the wiring harness for the brake fluid warning light switch.
9
Disconnect all hard brake lines connected to the valve.
10
Unbolt and remove the proportioning valve from its mount.
11
Install the new proportioning valve.
12
Locate the brake bleeder valve on the right (passenger side) rear brake.
13
Install a piece of clear plastic tubing over the brake bleeder screw and place the other end into a container with 2 to 3 inches of brake fluid.
14
Have an assistant pump and hold the brake pedal to build up pressure in the system.
15
Loosen the bleeder screw. Allow for brake fluid to evacuate through the bleeder screw opening.
16
Tighten or close the bleeder screw.
17
Repeat the bleeding process until there is no more air bubbles coming out.
18
Repeat steps 12-17 for the rest of the brakes starting with the left rear, right front, and then the left front.
19
Replace any components that were removed to gain access to the proportioning valve.
20
Lower the vehicle and road test.
21
Repeat steps 4-6 again to visually inspect and confirm that there are no more leaks from the proportioning valve.
22
Road test the vehicle and verify proportioning valve repair.
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