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 th e relay valve by the second control line. The first and second control lines a re 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 exhaustin g 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.