BENDIX BRAND NAME TRAILER SPRING BRAKE CONTROL VALVE ASSEMBLY KNOWN AS SR-2, SR-4, AND SR-5 TRAILER SPRING BRAKE (SR-2/4/50 VALVE ASSEMBLIES MANUFACTURED FROM MARCH 1, 2000, THROUGH APRIL 30, 2001. THE MOLDED RUBBER FACE OF THE INLET/EXHAUST VALVE (I/E VALVE) COMPONENT OF THE AFFECTED SR02/4/5/ CAN SEPARATE FROM THE VALVE’S METAL INSERT. AIR CAN BE TRAPPED BY A SEPARATED I/E VALVE CAUSING IT TO BALLOON AND BLOCK THE EXHAUST PASSAGE OF THE TRAILER SPRING BRAKE CIRCUIT.