In the same way, bleed the front brake lines on the proportioning valve. The spool inside the proportioning valve will eventually break loose due to the pressure reversal, equalizing the pressure between the front and rear brakes. The dashboard light will be turned off.

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What is the procedure for resetting a brake proportioning valve?

Changing the Brake Proportioning Valve
The brake proportioning valve should be near the back brake line. It will be equipped with one or two buttons….
With your fingers, press the reset button on the valve, which will reset the valve and make it work properly again. Check the brake fluid level.

What happens if a proportioning valve malfunctions?

Because the proportioning valve reduces the pressure sent to the rear brakes, when the brakes are applied, the rear wheels lock up. On wet surfaces, the wheels will also lock up more easily. Even gentle application of the rear brakes may cause them to feel squeaky.

Is it possible to clean a proportioning valve?

If it’s already in the system, I’d just flush it with new brake fluid. Clean it with brake cleaner if it’s off the truck. If you want to introduce fresh fluid into the proportioning valve later, you can re-bleed it.

How can you tell if a proportioning valve is bad?

When you suddenly apply the brakes, you may notice your car taking a nose dive. Then your car might not be able to stop quickly enough. It’s a sign that your proportioning valve is failing if your rear wheels lock up easily, especially when driving on wet surfaces.

What is the best way to test a proportioning valve?

To simulate a panic braking situation, have an assistant start the vehicle and apply heavy pedal pressure. As the piston moves, the paper clip should push against you and travel about 1/32″ to 1/16″. The piston has seized in the cap screw, and the valve will need to be replaced if the paper clip does not move.

What causes brakes to become mushy?

A common cause of a soft/spongy brake pedal is air in the brake line(s). If air happens to get into the brake lines, it can prevent the brake fluid from flowing properly, resulting in a spongy or soft brake pedal. This is a good time to change or flush the brake fluid if the brakes are soft or spongy.

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