Product Details: The Bendix R-12DC Series Air Brake Relay Valve is designed to provide precise control over the flow of air to the brake chambers of heavy duty vehicles. This valve helps to improve the braking performance of the vehicle, resulting in more efficient braking and better overall performance. It also helps to reduce maintenance costs and minimize downtime for vehicles. This valve is an ideal choice for those looking to improve the performance of their vehicle's braking system. FleetPride is your First Click in Heavy Duty®.