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QC Air Brake Test 3

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 QC commercial driver's licence manual
  • Updated for July 2024
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
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QC commercial driver's licence
5 out of 5,
1 votes
What you need to know

Driving a commercial vehicle is very different from driving a car. Trucks have different controls and different blind spots. As a commercial vehicle operator, you must travel long distances and face a variety of traffic and weather conditions. You must also be prepared to deal with emergencies such as fires and collisions. Before you can get your commercial driver’s licence in Quebec, you must study and practice to learn to drive carefully and safely. To get your commercial driver’s licence, you must pass both a written and a practical test. The written test (also known as the truck driver’s licence knowledge exam) has several multiple-choice questions. If you are looking for a practice test before taking the commercial driver’s licence knowledge test, this is the place. This practice test will help you prepare. Please note that this is a sample test and does not replace the official truck driver’s knowledge exam. There are 49 questions with hints and explanations of the correct answer. All questions are based on the official 2024 QC commercial driver’s manual. If you have any questions or comments, please contact us. Good luck!

What to expect on the official exam



correct answers to pass


passing score

List of questions (classic view)
  1. The air compressor should be inspected only when
  2. For the air brake inspection, what do you check first?
  3. In an S-cam drum brake, which of the following is connected to the brake spider?
  4. A brake shoe is not a part of
  5. Brake chambers are found on
  6. It does not matter if a small amount of oil is discovered during drainage of
  7. Compressed air from the air compressor first goes to the
  8. Compressed air exhaust is
  9. Compressed air entering the brake chambers applies
  10. Evacuating air from the brake chambers will apply
  11. A brake lining that has become contaminated with oil or grease indicates a problem with the
  12. An air line shows signs of wear from rubbing, but there are no leaks because the inner tube is still in good shape. What should you do?
  13. An alcohol evaporator or air dryer can
  14. Which tank is likely to collect the most moisture?
  15. Your vehicle will fail the air tank drain valve test if
  16. There is a split-second delay in activation of _________. There is no delay in activation of _________.
  17. The braking system converts the kinetic energy of the moving vehicle into
  18. When you drain the air tanks, which tank should you drain first?
  19. What is the purpose of the governor?
  20. The air compressor is powered by the
  21. Air pressure monitoring gauges are located on the _________ of the vehicle.
  22. The pushrod stroke occurs when compressed air enters
  23. When you press the brake pedal, the valve underneath the brake pedal ________ to apply the service brakes.
  24. Which of the following is part of a disc brake?
  25. If the low air pressure warning signal comes on, what should you do?
  26. In which of the following situations should a spring parking brake chamber be caged?
  27. In a tractor-trailer, an anti-compounding valve is connected to
  28. In Canada, automatic slack adjusters have been installed on trucks and trailers manufactured since
  29. When you use the free stroke (pry bar) method, the pushrod should not move more than
  30. If your vehicle is equipped with automatic slack adjusters, why must you fully apply the service brakes regularly?
  31. What function does the alcohol evaporator perform?
  32. To inspect an air brake system, you should wear
  33. When must you chock the wheels of your stopped vehicle?
  34. Finding a small bit of oil during an inspection is NOT serious if it's coming from
  35. When inspecting the brake chambers, you should check for which of the following?
  36. Cut-in pressure must never be lower than
  37. What colour is the parking brake control button?
  38. In an air brake system, spring brakes are intended for
  39. The pushrod stroke occurs when compressed air enters the
  40. In an air brake system, what does a governor do?
  41. What provides the compressed air to the air reservoirs of trailers and semi-trailers?
  42. If the compressor fails, will the service brakes function for a period?
  43. The role of the air pressure gauge is to measure...
  44. Where is the air purifier found?
  45. How many compressed air reservoirs do heavy vehicles have at minimum?
  46. Which statement is not true about air brakes?
  47. What occurs when the hand brake is used as a service brake?
  48. Apart from the steering column, where can the hand brake control be found?
  49. The triggering level for the low air pressure warning device varies based on the vehicle's braking system, but it never drops below...
  50. What happens when the air pressure drops too low in one of the circuits making the service brakes ineffective?