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Reply to "WANTED: Proportioning Valve"

Joe,

Be aware they are different animals,

The shuttle (differential) valve activates when a brake circuit (front or rear) is compromised to illuminate the brake fail warning light and also prevents loss of fluid from the non compromised side to help safely stop the car.

The proportioning valve is a pressure limiter that helps balance braking front and rear to prevent rear wheel lock prior to front wheel.
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