Practice question

Why is it dangerous to rapidly fan (pump) the foot brake pedal repeatedly on an air brake equipped truck?

Fanning the brake pedal releases large volumes of compressed air faster than the compressor can replace it, causing complete air pressure loss
It causes engine oil to leak into the fuel tank
It causes the steering wheel to vibrate and turn automatically
It increases braking force to dangerous levels

Answer: A — Fanning the brake pedal releases large volumes of compressed air faster than the compressor can replace it, causing complete air pressure loss

The correct answer is shown above. Try the full quiz for additional practice.