If the air pressure does not build up fast enough:

The air pressure may drop too low during driving.. Section 5.4: If pressure buildup is slow, you may not have enough air for emergency

If the air pressure does not build up fast enough:

ANSWER BREAKDOWN
  • A. Correct. If pressure buildup is slow, you may not have enough air for emergency stops. Do not drive.
  • B. Incorrect. "You should drive faster." is not correct. If pressure buildup is slow, you may not have enough air for emergency stops. Do not drive.
  • C. Incorrect. "It is normal." is not correct. If pressure buildup is slow, you may not have enough air for emergency stops. Do not drive.
  • D. Incorrect. "Use the hand brake." is not correct. If pressure buildup is slow, you may not have enough air for emergency stops. Do not drive.