The Bendix+ SR-5 valve is a reservoir-mounted trailer valve that can control up to four spring brake actuators during parking or emergency applications. It has the following capabilities: \n1. Automatically applies trailer spring brakes in the event of a breakaway or trailer supply line failure.\n2. Protects trailer reservoir(s) air pressure in the event of a breakaway or trailer supply line failure. \n3. Allows no automatic trailer spring brake application with air pressure loss in trailer reservoir(s).\n4. Allows the trailer spring brakes to be applied and released repeatedly with a failed trailer reservoir(s).\n5. Optional anti-compounding prevents an overriding service brake signal while the trailer supply line is at atmospheric pressure.\n6. Does not allow service system charging if a failure occurs in the parking brake circuit.