Remanufactured RT4 Multi-Function, Meets all FMVSS-121 trailer requirements for spring brake control and other regulations from October 1992 to current date. Interchangeable with competitive units. Used on trailers to control both parking and emergency brake functions. Controls reservoir charging. Applies emergency (parking) brakes upon loss of trailer supply (emergency) line pressure. The trailer control port is over reservoir port B. Replaces A99370X. Cover rotated 180 degrees. Repair Kit use part number: RN10JM.

Product Features:

• Remanufactured parts are completely disassembled and wearable parts replaced providing longer life than rebuilt parts
• ISO 9001 and MERA member certifying repeatable processes
• Remanufactured in the USA