CONTROL MODULE FOR A BRAKE SYSTEM FOR A SEMI-TRAILER

摘要

A brake system for an air braked trailer (30) includes a first control line (44) for transmitting air from a source, a second control line for transmitting air (46), a relay valve (48) for allowing air to flow therethrough, and a pneumatic control module (22) (PCM) having structure for reducing pressure from an inlet port of the PCM to an outlet port of the PCM. The PCM is connected to the first control line and is solely connected to the relay valve by the second control line. The first and second control lines are capable of being decoupled from the PCM and being coupled to each other to remove the PCM from the system so a technician can check the system. An exhaust valve is integrally connected to the PCM and is capable of exhausting air to atmosphere. When the system is used on a trailer, the PCM is mounted away from the relay valve, and preferably forwardly of a forward axle of the trailer.