The brake pedal in an air brake system:

Controls the air pressure applied to put on the brakes.. Section 5.1: Pressing the brake pedal allows compressed air to enter the brake

The brake pedal in an air brake system:

ANSWER BREAKDOWN
  • A. Incorrect. "Controls the speed of the air compressor." is not correct. Pressing the brake pedal allows compressed air to enter the brake chambers. Pushing harder applies more air pressure.
  • B. Correct. Pressing the brake pedal allows compressed air to enter the brake chambers. Pushing harder applies more air pressure.
  • C. Incorrect. "Is connected to the slack adjusters by a cable." is not correct. Pressing the brake pedal allows compressed air to enter the brake chambers. Pushing harder applies more air pressure.
  • D. Incorrect. "Only works if the engine is running." is not correct. Pressing the brake pedal allows compressed air to enter the brake chambers. Pushing harder applies more air pressure.