With the hand valve applied, you should check for:

Air flowing through the system to the rear brakes.. Section 7.4: When testing brakes, ensure air pressure is reaching the rear.

With the hand valve applied, you should check for:

ANSWER BREAKDOWN
  • A. Incorrect. "Air leaking from the open rear valve." is not correct. When testing brakes, ensure air pressure is reaching the rear.
  • B. Correct. When testing brakes, ensure air pressure is reaching the rear.
  • C. Incorrect. "The engine stopping." is not correct. When testing brakes, ensure air pressure is reaching the rear.
  • D. Incorrect. "The lights dimming." is not correct. When testing brakes, ensure air pressure is reaching the rear.