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Prop valve goes in the line to the back brakes. It regulates pressure back there and keeps the rear from locking up before the front. Locking the rear first can spin the car. Because of weight transfer to the front of the car during braking, the front set must carry most of the stopping power for stability. Stunt drivers spin cars by pulling the emergency brake which locks the rear brakes only. The car nose dives and the rear tires break free.

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