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    ON Air Brake Test 5 2023

    4.5 out of 5 • 4 votes.
    Based on 2023 ON commercial driver's license manual Instant feedback

    If you’re looking for a job in the trucking industry, completing the mandatory commercial driver’s licence knowledge exam is the first step towards achieving your dream. We have developed this 42-question Air Brake practice test to help you prepare for the province’s examination (also known as the Ontario trucking exam). Regardless of your current level of knowledge, this test will help you brush up on some important rules. You will likely perform better on the written test if you have been studying for it, so this is why it is so important to maintain your studying regiment. Know the rules, and the road will be a much safer place. Scroll down to begin the test.

    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. Which of the following is an advantage of wedge brakes over S-cam drum brakes?
    2. Assuming good traction and constant vehicle speed, if you double your vehicle's weight, your vehicle's braking distance will be
    3. When inspecting air brakes, you should wear
    4. For inspecting the air brakes, when should you chock the wheels?
    5. How can manual slack adjusters be adjusted?
    6. How should you test the spring brakes?
    7. Brake chambers of size 36 are marked with
    8. __________________are conected to the brake spider in "S" cam brake system.
    9. Automatic slack adjusters must be inspected
    10. Which of the following is most likely to have air brakes?
    11. According to the Official Ontario Air Brake Manual, when testing a combination vehicle's spring brakes, you should at least test ________ if possible.
    12. An antilock braking system (ABS)
    13. What to do when low air warning device activates on the road?
    14. The spring brakes are for
    15. Who can adjust the air brakes?
    16. How can you make sure that each air tank is securely attached to the vehicle?
    17. What does caging a brake chamber do?
    18. On a tractor-trailer, the red dashboard knob controls the spring brakes on __________, and the yellow dashboard knob controls the spring brakes on _________.
    19. Brakes are designed to withstand temperatures of up to
    20. DD3 safety actuators are mostly found in
    21. Trailer hand valve located on the tractor dashboard used to apply
    22. Which of the following is not a part of a braking system?
    23. How many airlines go to DD3 safety actuator brake chamber?
    24. Easiest way to test trailer`s spring brakes is
    25. Which of the following is most likely to lead to brake fade?
    26. When inspecting the air brake chambers, what should you look for?
    27. Brake fade can lead to
    28. Under the Ontario Highway Traffic Act, how often must air brakes be inspected?
    29. To test the trailer's service brakes independently of the tractor's service brakes, what should you do?
    30. When inspecting the brake drums, you should look for
    31. Compared with the service tanks, how much moisture should the supply tank discharge?
    32. If the low air pressure warning activates, you should
    33. To inspect an air brake system, you should wear
    34. The best way to reduce rough and abrupt braking is to
    35. What are the service brakes used for?
    36. Manufacturers recommend draining moisture and oil in an air brake system on a _______ basis.
    37. What is the "cut-out" level?
    38. What happens to the foot valve when you press down on the brake pedal?
    39. Why is it important to know which parts of the air brake system exhaust air?
    40. Which of these can strain your vehicle's braking system?
    41. What powers the air compressor?
    42. Which of these can contaminate a brake system's air lines?