Skip to main content
DMV Test Free
ENES

Practice test 6 of 10

Minnesota CDL — Air Brakes Practice Test 6

The Minnesota CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.

This practice test follows that format: 25 questions, pass with 20 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 25

  1. 1.What is the purpose of a modulating control valve?
  2. 2.What does the supply pressure gauge tell the driver?
  3. 3.What is a dual air brake system?
  4. 4.On newer air brake vehicles, what does the parking brake control usually look like?
  5. 5.What most commonly causes air brakes to fade?
  6. 6.Your brakes have gotten soaked driving through deep water. What does the manual tell you to do about it?
  7. 7.On the application pressure gauge, needing steadily more pressure to hold the same speed is a sign of what?
  8. 8.Which type of foundation brake is the most common on air brake vehicles?
  9. 9.Which way do you move the parking brake control knob to set and then release the parking brakes?
  10. 10.Why should you avoid pressing the brake pedal while the spring brakes are already applied?

0 of 25 answered