The Carlisle Brake & Friction single circuit and parallel circuit Relay Valves are capable of providing high flow to large displacement brakes to give quick brake reaction times. Carlisle Relay Valves feature modulating output pressures in a range of 600-3,500 psi (41 to 241 bar). The relay can be piloted by a pedal valve, remote E/H proportional valve or an integrated E/H proportional valve. Optional differential pressure switch monitors for brake failure.