brake balance

Is A Proportioning Valve Necessary With 4 Wheel Disc Brakes?

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Is A Proportioning Valve Necessary With 4 Wheel Disc Brakes? If I add disc brakes will I need a proportioning valve? Yes. The addition of a proportioning valve is a must. Without it your braking system will not operate properly. Do I have to use a proportioning valve? A Proportioning valve is required on vehicles