A cam shaft supportenclosure assembly for brake systems of heavy-duty vehicles is mounted on a beam of an axlesuspension system and includes a cam tube A bracket for mounting the cam tube on the beam includes a pair of plates that arc mounted on the beam. By an output of the detecting portion 11, a difference of currents or voltages of the conductors W1, W2 of the transmission lines is provided and an unbalance component between the conductors W1, W2 is detected. A feedback path is provided for in the transmissionreceiver unit to provide the transmission signal to the receiver path. Further, the registering unit registers the offer conditions as a registration information when the purchasing result indicates that the sales conditions match with the offer conditions and a notice from the purchaser indicates agreement to the purchasing result. The file-based processing uses an incoming queue and outgoing queue to simplify the interface. Further, the user may be instructed to optimize the system according to the time spent on system shutdown.