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Should the shutoff valves on the rear of the last trailer be open or closed? What about on the first trailer of a set of doubles? And on the middle trailer of a set of triples?

A. Open on all trailers
B. Closed on all trailers
C. Open on the last trailer, closed on the first and middle trailers
D. Closed on the last trailer, open on the first and middle trailers

Answer :

Final answer:

Generally, the shutoff valves on the rear of the last trailer, the first trailer and a set of doubles should be open, while the valve on the middle trailer of a set of triples should be closed for optimal functionality of the vehicle's air brake system.

Explanation:

The setting of the shutoff valves depends on the specific needs and circumstances of the situation. However, speaking in general terms, the shutoff valves on the rear of the last trailer should be open to allow air flow for the brake system. Likewise, the valves on the first trailer and a set of doubles should be open as well. The valves on the middle trailer of a set of triples should be closed because it is being supplied air from both ends. This increases efficiency and safety of air brake system operation in triple combination vehicle.

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