ON Air Brake Test 3
- Perfect for first-time and renewal commercial applicants, and those adding endorsements
- Based on 2024 ON commercial driver's licence manual
- Triple-checked for accuracy
- Updated for June 2024
About this test
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 Ontario, 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 ON commercial driver’s manual. If you have any questions or comments, please contact us. Good luck!
What to expect on the actual ON exam
questions
correct answers to pass
passing score
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List of questions (classic view)
- The air compressor should be inspected only when
- For the air brake inspection, what do you check first?
- In an S-cam drum brake, which of the following is connected to the brake spider?
- A brake shoe is not a part of
- Brake chambers are found on
- It does not matter if a small amount of oil is discovered during drainage of
- Compressed air from the air compressor first goes to the
- Compressed air exhaust is
- Compressed air entering the brake chambers applies
- Evacuating air from the brake chambers will apply
- A brake lining that has become contaminated with oil or grease indicates a problem with the
- 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?
- An alcohol evaporator or air dryer can
- Which tank is likely to collect the most moisture?
- Your vehicle will fail the air tank drain valve test if
- There is a split-second delay in activation of _________. There is no delay in activation of _________.
- The braking system converts the kinetic energy of the moving vehicle into
- When you drain the air tanks, which tank should you drain first?
- What is the purpose of the governor?
- The air compressor is powered by the
- Air pressure monitoring gauges are located on the _________ of the vehicle.
- The pushrod stroke occurs when compressed air enters
- When you press the brake pedal, the valve underneath the brake pedal ________ to apply the service brakes.
- Which of the following is part of a disc brake?
- If the low air pressure warning signal comes on, what should you do?
- In a tractor-trailer, an anti-compounding valve is connected to
- In Canada, automatic slack adjusters have been installed on trucks and trailers manufactured since
- When you use the free stroke (pry bar) method, the pushrod should not move more than
- If your vehicle is equipped with automatic slack adjusters, why must you fully apply the service brakes regularly?
- In Canada, antilock braking systems (ABS) have been mandatory on all trucks and buses over 4,560 kg that have been manufactured since
- Which of these significantly decreases the braking force produced at the wheel?
- Which type of trailer can be towed before the service tanks are full?
- In determining how well your air brake system works, which is NOT a significant factor?
- In large commercial vehicles, most air brake systems use automatic valves to
- Where are a vehicle's air tanks located?
- What is the "cut-in" level?
- Normally, who can adjust automatic slack adjusters?
- Which statement is true of spring brakes?
- Which colour coding is usually employed for the service line?
- Why are there two service tanks in a modern air brake system?
- What is a "glad hand"?
- What function does the alcohol evaporator perform?
- To inspect an air brake system, you should wear
- When must you chock the wheels of your stopped vehicle?
- Finding a small bit of oil during an inspection is NOT serious if it's coming from
- When inspecting the brake chambers, you should check for which of the following?
- Cut-in pressure must never be lower than
- What colour is the parking brake control button?
- In an air brake system, spring brakes are intended for
- The pushrod stroke occurs when compressed air enters the