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BC Air Brake Test 3

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 BC 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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BC commercial driver's licence
5 out of 5,
2 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 British Columbia, 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 50 questions with hints and explanations of the correct answer. All questions are based on the official 2024 BC 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. If air is lost in one circuit of a tractor-trailer's dual-circuit system but the compressor and governor are still working properly,
  27. Who is ultimately responsible for the condition of the brakes on a vehicle?
  28. Spring-type parking brakes are held in the released position by
  29. The "Trucks Stop Here – Check Brakes" sign before a steep downgrade is
  30. The distance that a vehicle travels from the time that the vehicle's brakes are applied to the time that the vehicle stops is known as its
  31. At a fast engine idle, the compressor must be capable of building up reservoir pressure from 50 psi to 90 psi in less than
  32. Which of the following statements are true about a foot control valve?
  33. The low air pressure warning device must operate when reservoir air pressure drops below
  34. What is the purpose of the hand valve?
  35. The minimum governor cut-in pressure is
  36. The maximum pressure available at any given time for a full brake application depends on
  37. The most common cause of loss of air between the tractor and the trailer is
  38. In a vehicle equipped with air brakes, the most common cause of loss of braking power is
  39. What maintains normal pressures in the air brake system?
  40. How can you make sure that your brakes are properly adjusted?
  41. How do you apply the parking brakes?
  42. Your vehicle's air compressor is belt driven. How do you check for correct belt tension?
  43. Which of these is not a part of a drum brake?
  44. When brakes become overheated, they also become
  45. What is a "glad hand"?
  46. What function does the alcohol evaporator perform?
  47. To inspect an air brake system, you should wear
  48. When must you chock the wheels of your stopped vehicle?
  49. Finding a small bit of oil during an inspection is NOT serious if it's coming from
  50. When inspecting the brake chambers, you should check for which of the following?