In a double trailer combination, the shut-off valves at the back of the front trailer should be:

Open.. Section 6.2: They must be OPEN to let air flow to the rear trailer.

In a double trailer combination, the shut-off valves at the back of the front trailer should be:

ANSWER BREAKDOWN
  • A. Correct. They must be OPEN to let air flow to the rear trailer.
  • B. Incorrect. "Closed." is not correct. They must be OPEN to let air flow to the rear trailer.
  • C. Incorrect. "Removed." is not correct. They must be OPEN to let air flow to the rear trailer.
  • D. Incorrect. "Partially open." is not correct. They must be OPEN to let air flow to the rear trailer.