With drum brakes a ten pound valve is used to compensate for return spring tension in the drums. Features 1/8” pipe thread inlet and outlet you must a brake line adaptor sold separately. Most residual valves are color coded blue for 2 psi and red for 10 psi. An RPV DOES NOT cause brake drag, or cause the rear brakes to lock-up first! For in-line use, 2 psi RPV in a disc brake circuit, and a 10 psi unit for drum brakes. 1/8" female NPT inlet/outlet.
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