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If you get a m/c for a drum/drum (original) application, it will probably have a residual pressure valve in each port. You will have to remove the r.p. valve from the port going to your front disc brakes. - - - If you get a m/c for a disc/drum (original) application, it will probably only have a residual pressure valve for the drum circuit. - - - - - - - - - - - - - - -- - If you get a m/c for a disc/disc (original) application, there may not be any r.p.v.'s inside. - - - - - - - The drum brakes NEED a residual pressure valve, to prevent air from being drawn in through the wheel cylinders. Drum brake r.p.v.'s are usually rated at 10psi. - - - - IF your master cylinder is mounted below (or close to) the height of the front calipers, a 2psi r.p.v. should be installed in the front circuit. - - - - - If you try to cheat, and use a drum brake r.p.v. in the disc circuit, the calipers will not release properly, and the front brakes will drag.
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