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Proportioning Valve And Metering Valve

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Since most of the braking is done by the front wheels, a proportioning valve is used to limit pressure to the rear brakes so they don't lock up prematurely. This factory unit also includes a metering valve for the front discs and a warning light switch in case pressure in the front or rear is lost, so it is called a combination valve. An adjustable proportioning valve can be a handy item for dialing in the amount of rear pressure on any custom brake setup, but it isn't always necessary.