SR4 Spring Brake Valve

The Automann 170.101622 SR-4 Type Spring Brake Valve is engineered for rugged use in heavy-duty trailer air brake systems. Its SR-4 designation denotes its ability to use trailer service reservoir pressure to release spring brakes, while also providing emergency/parking brake control in a single body. With integral check valves, this unit isolates a failed reservoir, preventing unintended brake application. It fits standard 1/2″ NPT supply/reservoir ports and modulates air to the spring brake system with precision. Cross-referenced to major OEMs, it serves as a drop-in replacement for many Bendix, Velvac, Keene, and Euclid units. Wofford Truck Parts sells it with fast shipping, quality guarantee, and support. This valve helps fleets maintain safe braking performance, reduce maintenance cycles, and simplify inventory by consolidating to a reliable aftermarket alternative.