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16. With that much pressure going to each corner, our rear brakes were locking up too early and bringing the rear of the truck around during hard braking. To equal out the fluid distribution, we installed this brake proportioning valve from Wilwood. It should also be noted that using stainless braided or hard lines is needed when installing a hydraboost unit, as the soft rubber hoses from the factory may be worn and cracked, which could cause a leak or brake failure at such high pressures.