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    FREE Ontario Air Brake Practice Test 2023 | ON

    4.32 out of 5 • 76 votes.
    Based on 2023 ON commercial driver's license manual Instant feedback

    If you want to drive a truck in Ontario, you need a commercial truck driver’s licence. With a commercial driver’s licence, you can work for a trucking company as an employee or work for yourself as an owner-operator. The transportation industry in Ontario is booming, and truck drivers are in high demand. As a driver of one of the largest vehicles on the road, you must study and practice to learn to drive carefully and safely. Before you can get your commercial driver’s licence, you must pass both a written and a practical test. The written test (also known as the Ontario truck driver’s licence knowledge exam) has several multiple-choice questions. You must get at least an 80% to pass the knowledge exam. The knowledge test for each class of licence typically takes approximately 30 minutes. For the practical test, you will meet with an examiner to demonstrate your knowledge of the operation of a truck. The official Commercial Driver’s Handbooks are great resources, but they lack practice. This 40-question ON Air Brake practice test is a great way to start as it covers the basics of commercial driving in Ontario. All questions are based on the official 2023 ON commercial driver’s manual. As you answer the questions, we recommend checking each question’s explanation to gain some further insight into the rule behind it. Good luck and drive safely!

    Perfect for:

    • First-time ON commercial license applicants
    • Existing commercial license holders adding endorsements
    • ON commercial license renewal applicants

    What to expect on the actual ON commercial license exam:

    • 25 questions
    • 20 correct answers to pass
    • 80% passing score

    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. When draining the air tanks, you observe excessive oil coming out of the supply tank. Which of the following is most likely to be faulty?
    28. Wedge brakes are designed to be
    29. Where are the air brake chambers located?
    30. What does an ABS system do?
    31. When you are going at twice the speed, your service brakes will need to work _________ to stop your vehicle.
    32. Which of these significantly decreases the braking force produced at the wheel?
    33. Which type of trailer can be towed before the service tanks are full?
    34. In determining how well your air brake system works, which is NOT a significant factor?
    35. In large commercial vehicles, most air brake systems use automatic valves to
    36. Where are a vehicle's air tanks located?
    37. What is the "cut-in" level?
    38. Normally, who can adjust automatic slack adjusters?
    39. Which statement is true of spring brakes?
    40. Which colour coding is usually employed for the service line?
    41. Why are there two service tanks in a modern air brake system?