To test the low pressure warning signal, you should:

Shut the engine off when you have enough air pressure, turn on the electrical power, and step on and off the brake pedal to reduce air

To test the low pressure warning signal, you should:

ANSWER BREAKDOWN
  • A. Correct. To test the warning, fan the brakes with the engine off but electrical power on. The alarm should sound before 60 psi.
  • B. Incorrect. "Drain the air tanks." is not correct. To test the warning, fan the brakes with the engine off but electrical power on. The alarm should sound before 60 psi.
  • C. Incorrect. "Drive and brake hard." is not correct. To test the warning, fan the brakes with the engine off but electrical power on. The alarm should sound before 60 psi.
  • D. Incorrect. "Disconnect the air lines." is not correct. To test the warning, fan the brakes with the engine off but electrical power on. The alarm should sound before 60 psi.