| 摘要 |
A vehicle brake system for an arrangement having a prime mover and at least one tandem trailer. The system includes a respective sub-system for the prime mover and each tandem trailer and each sub-system has a plurality of spring brakes which are held out of a park mode by pressurized air in a hold-back chamber and are caused to operate in a normal manner by pressurized air supplied to a service chamber. Each sub-system includes a service relay valve which is operable to connect pressurized air with the service chambers of the respective spring brakes and the prime mover sub-system includes a control relay valve which is operable to cause operation of the service relay valves of that sub-system and the adjacent tandem trailer sub-system. If there are two or more tandem trailers, each tandem trailer sub-system apart from the last includes a control relay valve and each succeeding control relay valve is operated as a consequence of operation of the control relay valve of the respective preceding sub-system.
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