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  • Based on 2025 BC commercial driver's licence manual
  • Updated for January 2025

A commercial truck driver’s licence is required to drive any commercial vehicle in British Columbia. There are two types of driving jobs available: owner-operator and employee. If you plan on running your own business or becoming a driver-for-hire, you will need a truck driver’s licence. To receive a trucking licence, you will have to pass two exams: a commercial knowledge exam with multiple-choice questions and a road test, which will test your general driving skills. To help you study for the knowledge test, we have prepared this second practice exam with 50 questions to test your knowledge of driving large vehicles in British Columbia. We encourage you to read the hints and explanations provided and check out our sources. You will notice that the questions are slightly more difficult. This is because they start to examine some of the more technical definitions and concepts found in the official 2025 BC commercial driver’s manual. Once you have studied these questions, giving another truck driver practice test a try may be a good idea. Good luck!

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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
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.
What to expect on the official exam
50

questions

40

correct answers to pass

80

passing score

List of questions (classic view)
  1. If there is a loss of pressure in the trailer supply line, you would expect the trailer brakes to be applied and
  2. If the air pressure reaches 150 psi, the safety valve will open. Where is the safety valve located?
  3. The low air warning device must activate by the time that tank air pressure falls to
  4. Tank air pressure must not drop below _______ while the vehicle is in operation.
  5. Minimum governor cut-out pressure is
  6. In British Columbia, when you test the system air-loss rate of a bus or straight truck, the maximum acceptable leakage rate is 4 psi within
  7. Maximum governor cut-out pressure is
  8. When you test the system air-loss rate, the maximum acceptable leakage rates per minute for a straight truck, a tractor pulling one trailer, and a tractor pulling two trailers are
  9. With the engine idling at _________, the air pressure must rise from 50 psi to 90 psi within three minutes.
  10. Minimum governor cut-in pressure is
  11. The governor cut-in pressure is normally _________ below the cut-out pressure.
  12. Air pressure must rise _____________ with the engine idling at 600–900 rpm within 3 minutes.
  13. Before beginning the air-loss tests of the air braking system, make sure that the air pressure approximately equals
  14. The spring brakes will start to apply when the air pressure falls below
  15. A tractor-trailer with one trailer will fail the air-loss rate test if the loss rate exceeds
  16. The trailer air supply valve will close automatically if air pressure in the trailer supply line drops to
  17. A tractor-trailer with two trailers will fail the air-loss rate test if the loss rate exceeds
  18. Before beginning the air-loss tests of the air braking system, make sure that the air pressure has risen to at least
  19. The air-loss rate test can be performed only when
  20. Air compressors can either be driven by the engine belt and pulleys or
  21. The spring brake test is passed if the vehicle
  22. Different sizes of brake chamber on the same axle can cause
  23. To test the air brakes, the vehicle should be parked
  24. In a drum brake, the brake linings are attached to
  25. Where is the air dryer located?
  26. If you find a major defect in the air brake system, you should
  27. You're parking a tractor-trailer whose trailer does not have spring brakes, so you set the trailer service brakes. If the trailer air tank drains,
  28. If brake chamber pushrod travel becomes excessive,
  29. The effectiveness of the spring brakes for emergencies or parking
  30. If an air line ruptures between the compressor and the supply reservoir, what will prevent loss of air pressure in the service brake system?
  31. Assuming good traction and constant vehicle speed, if you double your vehicle's weight, the braking power to stop your vehicle in the same distance will be
  32. You're driving a tractor-trailer. If the trailer breaks away from the tractor, what will activate the trailer brakes to stop the trailer?
  33. If the trailer breaks away from the tractor, the flow of air through the supply line will stop when the air pressure decreases to
  34. A vehicle that is twice the weight of a car and is travelling at twice the speed of that car requires how much braking power to stop in the same distance?
  35. If you must adjust an automatic slack adjuster that has a square adjusting bolt, you should turn the adjusting bolt in which direction?
  36. If you must adjust an automatic slack adjuster that has a hexagonal (six-sided) adjusting bolt, you should turn the adjusting bolt in which direction?
  37. If you're using the applied stroke method during your pre-trip inspection, pushrod travel must not exceed
  38. You're driving a vehicle equipped with an automatic front-wheel limiting system (ratio valve). If you brake hard during an emergency stop, the air pressure delivered to the front brakes will be approximately _____ of the air pressure to the rear brakes.
  39. During your brake tests, you find that the brakes are not operating safely. What should you do?
  40. After you have started your trip, you notice that the brakes do not seem to be holding even though reservoir pressures are satisfactory. What should you do?
  41. An improper angle between the slack adjuster and brake chamber pushrod when the brakes are applied can be corrected by
  42. Normally, who can adjust automatic slack adjusters?
  43. Which statement is true of spring brakes?
  44. Which colour coding is usually employed for the service line?
  45. Why are there two service tanks in a modern air brake system?
  46. What is the most frequent reason for placing a commercial vehicle out of service?
  47. How can you check whether the trailer spring brakes have activated?
  48. Which of these vehicles is most likely to be equipped with air brakes?
  49. Where is the air pressure gauge for the service tanks?
  50. Which colour is the trailer supply line?
  51. What can cause the air pressure in the air brake system to drop?