Practice question

A shut-off valve:

  1. Is located on the front of a trailer.
  2. Is located on the instrument panel.
  3. Prevents air from escaping an air brake system.
  4. Should always be open.

Answer: C — Prevents air from escaping an air brake system.

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

Practice more: Kansas CDL Combination Test 2 →