Ensure your semi is ready for the long haul with enhanced control of its spring brakes, with the OTR 90° Rotation Spring Brake Control Valve with Expertise Built In. By utilizing an open/close mechanism, this replacement valve is able to regulate the supply of compressed air in the spring brakes. Built to help synchronize the performance of the emergency brakes for tractors and trailers. FleetPride is your First Click in Heavy Duty.