Why should you not fan (pump) the brakes on and off during a long downgrade?

It wastes air pressure.. Section 5.4: Fanning the brakes releases air faster than the compressor can replace it, lowering tank pressure

Why should you not fan (pump) the brakes on and off during a long downgrade?

ANSWER BREAKDOWN
  • A. Incorrect. "It makes the brake lights flash too much." is not correct. Fanning the brakes releases air faster than the compressor can replace it, lowering tank pressure dangerously.
  • B. Correct. Fanning the brakes releases air faster than the compressor can replace it, lowering tank pressure dangerously.
  • C. Incorrect. "It heats up the brakes too quickly." is not correct. Fanning the brakes releases air faster than the compressor can replace it, lowering tank pressure dangerously.
  • D. Incorrect. "It uses too much fuel." is not correct. Fanning the brakes releases air faster than the compressor can replace it, lowering tank pressure dangerously.