You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:

At normal pressure.. Section 6.2: Wait for air pressure to reach normal range before driving.

You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:

ANSWER BREAKDOWN
  • A. Incorrect. "Empty." is not correct. Wait for air pressure to reach normal range before driving.
  • B. Correct. Wait for air pressure to reach normal range before driving.
  • C. Incorrect. "Half full." is not correct. Wait for air pressure to reach normal range before driving.
  • D. Incorrect. "Leaking." is not correct. Wait for air pressure to reach normal range before driving.