The Stovebolt Site Forums The Shop Area General Truck Talk brake residual valves

Hy cassie, If you have drum brakes then residual pressure valves are needed (10 p.s.i.), all drum brake master cylinders have residual pressure valves built into them. A lot of the kits sold to convert to dual master cylinder from a single system master use master cylinders from a Corvette which had disc brakes all around, so no built in residual pressure valves. If the master cylinder being installed is from a disc/disc car then each circuit of drum brakes will require a 10 p.s.i. residual pressure valve to function as the drum brake circuit was designed to function. If the master cylinder is installed below the level of disc brake calipers then a 2 p.s.i. residual pressure valve should be installed in that circuit to prevent drainback to the master from the caliper, hope that helps