Practice question

An air supply control lever should be in its "normal" position when you are:

  1. Changing a tire.
  2. Applying the trailer emergency brakes.
  3. Pulling a trailer.
  4. Using your spring brakes.

Answer: C — Pulling a trailer.

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

Practice more: West Virginia CDL Combination Test 1 →