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Answer :
Final answer:
The air brake shut-off valves on the last trailer in any combination should be open, while those on the first trailer in a set of doubles, and the middle trailer in a set of triples, should be closed for safety and correct functioning of the brake system.
Explanation:
In truck driving, particularly with double and triple trailers, the state of the air brake shut-off valves is crucial for safety. On the last trailer in any combination, the shut-off valves must be open. This allows the air pressure to transmit through the brake system to ensure proper function.
On the other hand, the shut-off valves on the first trailer in a set of doubles and the middle trailer in a set of triples should be closed. When the shut-off valves are closed, it prevents the air from going to the rear of the combination. This is a necessary step in setting up the air brake system for doubles and triples.
The shut-off valves on the rear of the last trailer in a set of trailers should be closed. This is to prevent leaks and ensure that the air supply is not interrupted. On the other hand, the shut-off valves on the rear of the first trailer in a set of doubles and the middle trailer in a set of triples should be open. These valves allow for the flow of compressed air from the tractor to the rest of the trailers.
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