How to Reset a Brake Proportioning Valve

by Dianne Hermance

A brake proportioning valve is typically located in the rear brake line and enables you to adjust the rate of pressure increase to the rear brakes. It changes the proportion of brake fluid. You can slow down the pressure increase that happens when you apply the brakes with a brake proportioning valve. After continued use, the proportioning valve can become out of alignment and it may need to be reset. It is helpful to have some knowledge of vehicle mechanics to complete this task, but it is unnecessary.

Step 1

Locate the brake proportioning valve near the rear brake line. It will have one or two buttons located on it. The reset button usually has a rubber cap on it. It is an "L"-shaped metal valve.

Step 2

Push the reset button located on the valve with your fingers, which will reset it so the valve is working properly again.

Step 3

Inspect the brake pressure. If the pressure is restored to the brake line and your brakes seem to be working properly again, then the reset button worked. If the proportioning valve needs to be reset, brake fluid will not be getting through to the brakes.

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