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Using Air Brakes

Using Air Brakes is a required knowledge area under 49 CFR 383.111(b)(7), covering general air brake operating practices a driver must know.

Practice Using Air Brakes

5 Questions

  1. What is the correct braking technique for controlling speed on a long, steep downgrade in a vehicle with air brakes?
  2. A tractor-trailer combination has ABS on the tractor only, not on the trailer. How should the driver brake?
  3. What is the difference between the "controlled braking" and "stab braking" methods for an emergency stop?
  4. Why does a heavily loaded vehicle take an especially long distance to stop once its spring brakes engage from low air pressure?
  5. What does "brake lag" mean in the context of an air brake system's total stopping distance?