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  • Based on 2025 QC commercial driver's licence manual
  • Updated for May 2025

FREE QC Air Brake Practice Test 1

Looking for some help to pass your Quebec Air Brake knowledge test? You’ve come to the right place! This is the first of our ten Quebec Air Brake Practice Tests. We carefully designed them to help you pass the official Air Brakes knowledge test – on your first try.

All applicants for a heavy-vehicle driver’s licence (Classes 1, 2, or 3) must have held a Class 5 driver’s licence for at least two years, passed a vision test, and passed a medical exam. Then you must pass a general knowledge test on the theory of commercial driving. For an Air Brake (“F”) Endorsement, you must also pass a separate Air Brake knowledge test. This endorsement is mandatory for Class 1, optional for Classes 2 and 3, and unavailable for Classes 4A, 4B, and 4C. The air brake test questions are based on information in the official SAAQ manual, Driving a Heavy Vehicle. It’s advisable to register for both knowledge tests at the same time. For the “F” endorsement, you must pass the “F” knowledge test before you take your road tests.

Passing the general knowledge test will entitle you to a commercial learner’s permit, which will allow you to practice commercial driving under supervision. For Classes 1 and 2, you must hold the permit for at least three months. To become a school bus driver, you must also complete an approved training course on driving school buses. Completing an approved training course is not required for other types of heavy vehicles, but doing so may shorten the permit’s required holding period.

When you’re ready, you can schedule your two road tests for your commercial driver’s licence. The first test is a circle check test, in which you inspect the vehicle’s mechanical components. The second test is a driving test. You must take these tests in a vehicle that’s representative of the class of licence you’re applying for. For a Class 1 licence or another class of commercial licence with an air brake endorsement, you must take the road tests in a vehicle equipped with air brakes.

This Quebec Air Brakes Practice Test includes 45 multiple-choice questions on air brakes. All questions are up to date as of May 2025 and based on Driving a Heavy Vehicle.

If you get stuck on a practice question, you can ask our AI Assistant to discuss the question further, give you a hint, or answer your own questions about commercial driving. If you still miss the question, you’ll be shown the correct answer and an explanation.

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  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Triple-checked for accuracy

What you need to know

5 out of 5 • 1 votes
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.
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List of questions (classic view)
  1. Should you pump (keep pressing and releasing) air brakes?
  2. It is important to keep compressed air as dry as possible because
  3. What does the low air pressure warning device warn you about?
  4. If the low air pressure warning signal comes on, what should you do?
  5. The effectiveness of the spring brakes for emergencies or parking
  6. During normal driving, what keeps the spring brakes released?
  7. Assuming good traction and constant vehicle weight, if you double your speed, your vehicle's braking distance will be
  8. If drum brakes overheat, the vehicle's stopping distance will increase. What is the reason for this?
  9. Air braking systems tend to react slower than hydraulic braking systems because
  10. While travelling downhill, you notice that each time you want to brake, you must press the brake pedal farther down than the last time to achieve the same braking force. What could be causing this?
  11. The maximum air pressure available for braking is determined by
  12. The foot (treadle) valve
  13. Which of the following can impair braking effectiveness?
  14. After you apply the service brakes, what happens to that compressed air?
  15. What does an alcohol evaporator do?
  16. When you test the system air-loss rate, the maximum acceptable leakage rates per minute after the initial drop are
  17. You're driving a vehicle equipped with a dual air brake system. The low air pressure warning signal comes on, but one system still has normal pressure. What should you do?
  18. How should you test your vehicle's low air pressure warning signal?
  19. An application pressure gauge shows the air pressure
  20. All vehicles equipped with air brakes must have
  21. What is the colour coding that is often used for the supply and service lines to the trailer?
  22. The hand valve of a tractor-trailer
  23. In a vehicle equipped with air brakes, what does the governor control?
  24. Polarized gladhands on a tractor
  25. ln vehicles with three dash-mounted push-pull valve knobs, how are the valve knobs usually coloured?
  26. Which of the following are major components of the air supply circuit?
  27. Wedge brakes are designed to be
  28. Where are the air brake chambers located?
  29. What does an ABS system do?
  30. When you are going at twice the speed, your service brakes will need to work _________ to stop your vehicle.
  31. Which of these significantly decreases the braking force produced at the wheel?
  32. Which type of trailer can be towed before the service tanks are full?
  33. In determining how well your air brake system works, which is NOT a significant factor?
  34. In large commercial vehicles, most air brake systems use automatic valves to
  35. Where are a vehicle's air tanks located?
  36. What is the "cut-in" level?
  37. Normally, who can adjust automatic slack adjusters?
  38. Which statement is true of spring brakes?
  39. Which colour coding is usually employed for the service line?
  40. Why are there two service tanks in a modern air brake system?
  41. What is the most frequent reason for placing a commercial vehicle out of service?
  42. What powers the air compressor?
  43. After the air compressor compresses the air, where does the air go?
  44. How frequently should the air reservoirs be drained completely in order to eliminate potential issues?
  45. What is required for your service brakes to work correctly?
  46. What effect does operating the parking brake control have?
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