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"How to Reset a Brake Proportioning Valve. 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."
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