The common name is "height-sensing proportioning valve". All vehicles have a proportioning valve to limit the amount of fluid pressure to the rear brakes during hard stops. That reduces their tendency to lock up. Trucks and minivans typically use an adjustable proportioning valve because there can be such a wide range of load in the rear. With more weight in the rear, more braking power is needed, and that weight will prevent the rear tires from skidding when they get more fluid pressure.
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Tuesday, November 19th, 2013 AT 5:20 PM