Product Details: Prepare your semi to be Ready for the Road Ahead™, with the Bendix QR-1® Series Open Exhaust Quick Release Valve that provides a rapid release of air brake pressure. To stop or slow a trailer as needed, this replacement valve quickly releases compressed air from the brake chambers into the brake shoes. Fashioned with top-tier materials to tolerate extreme conditions. FleetPride is your First Click in Heavy Duty®.