When used, a proportioning valve is installed in the line to the rear drum brakes in order to:

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Multiple Choice

When used, a proportioning valve is installed in the line to the rear drum brakes in order to:

The main idea is brake balance between the front and rear wheels. A proportioning valve lowers the pressure going to the rear brakes when brake pressure rises, which helps prevent the rear wheels from locking up during hard braking. With weight shifting to the front under braking, the rear brakes can otherwise lock more easily; reducing their pressure keeps the car stable and controllable. Increasing rear brake force or chasing pedal feel aren’t the primary goals, and while the valve does reduce pressure to the rear, the key purpose is to prevent rear wheel lock-up.

The main idea is brake balance between the front and rear wheels. A proportioning valve lowers the pressure going to the rear brakes when brake pressure rises, which helps prevent the rear wheels from locking up during hard braking. With weight shifting to the front under braking, the rear brakes can otherwise lock more easily; reducing their pressure keeps the car stable and controllable. Increasing rear brake force or chasing pedal feel aren’t the primary goals, and while the valve does reduce pressure to the rear, the key purpose is to prevent rear wheel lock-up.

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