Pennsylvania CDL Double/Triple Trailers Practice Test

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What should be done with the rear trailer air shut-off valves after uncoupling lines from a trailer that will be parked?

Close or secure them as required so contaminants stay out and air does not escape on later coupling Leave all valves open indefinitely Remove the valves Tie the valves open with wire

Correct Answer:

Close or secure them as required so contaminants stay out and air does not escape on later coupling

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