Find a donor 5th wheel truck and remove ALL of the air brake parts for the trailer and transfer to your truck. Doing it that way will be way cheaper than buying it one piece at a time. Also, make sure you take good notes and pictures of how everything is connected together before you take it apart. Google truck air brake diagrams and get familure with the system before you go hunting so you have a rough idea of what your looking at and what it does.
Mike B
