The Bendix+ R-14+ relay valve in an air brake system functions as a relay station to speed up the application and release of the brakes The valve is normally mounted at the rear of the vehicle in proximity to the chambers it serves The valve operates as a remote controlled brake valve that delivers or releases air to the chambers in response to the control air delivered to it from the foot brake valve or other source The R-14+ valve differs from the R-12+ valve in that it incorporates a quick release and anticompounding feature located above its horizontal service port The R-14+ valve's anti-compound feature allows it to be conveniently used as either a service or spring brake relay valve An exhaust cover is installed that protects the 1-8- balance port when the R-14+ valve anti-compound feature is not in use \nMost parts are interchangeable between the R-12+, R-12DC+, and R-14+ valves with the exception of the detail components of the valve covers Bendix+ relay valves make extensive use of non-metallic internal components For ease of servicing, the inlet-exhaust valve can be replaced without the need for line removal