FREE BC Air Brake Test 1

If you want to drive a truck in British Columbia, 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 British Columbia 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 British Columbia 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 BC Air Brake practice test is a great way to start as it covers the basics of commercial driving in British Columbia. All questions are based on the official 2025 BC 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 and renewal commercial applicants, and those adding endorsements
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What you need to know

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Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

What to expect on the official exam

questions

correct answers to pass

passing score

Helpful links

BC Driver and Vehicle Services

Official British Columbia driver's manual (2025)

Our commitment to accuracy and quality in our practice tests

Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Tests.ca, we understand the importance of reliable and accurate practice tests to help you prepare for your driver's knowledge exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Driving Handbooks:
Every question we develop is based on the most recent version of each province's official driving manual. Our team regularly monitors each province's official website for the latest updates to ensure our practice tests are always aligned with the most current information.
Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation.
Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors.
User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly.
Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the provincial government manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the government publishes them.

Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your driver's knowledge exam.

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List of questions (classic view)

Should you pump (keep pressing and releasing) air brakes?
It is important to keep compressed air as dry as possible because
What does the low air pressure warning device warn you about?
If the low air pressure warning signal comes on, what should you do?
The effectiveness of the spring brakes for emergencies or parking
During normal driving, what keeps the spring brakes released?
Assuming good traction and constant vehicle weight, if you double your speed, your vehicle's braking distance will be
If drum brakes overheat, the vehicle's stopping distance will increase. What is the reason for this?
Air braking systems tend to react slower than hydraulic braking systems because
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?
The maximum air pressure available for braking is determined by
The foot (treadle) valve
Which of the following can impair braking effectiveness?
After you apply the service brakes, what happens to that compressed air?
What does an alcohol evaporator do?
When you test the system air-loss rate, the maximum acceptable air-loss rate per minute after the initial drop is ________ except for vehicles with two trailers.
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?
How should you test your vehicle's low air pressure warning signal?
An application pressure gauge shows the air pressure
All vehicles equipped with air brakes must have
What is the colour coding that is often used for the supply and service lines to the trailer?
The hand valve of a tractor-trailer
In a vehicle equipped with air brakes, what does the governor control?
Polarized gladhands on a tractor
ln vehicles with three dash-mounted push-pull valve knobs, how are the valve knobs usually coloured?
What is the purpose of a quick release valve?
What is an advantage of automatic slack adjusters?
You must make heavy brake applications as part of your pre-trip inspection. Why should you release the spring brakes first?
In a tractor-trailer, blended air is air from
How is the heat produced by your vehicle's brakes dissipated?
What is brake lag?
Drivers must hold an industrial air brake endorsement if they will be __________ on industrial roads.
As part of your pre-trip inspection of a combination vehicle with air brakes and one trailer, you should make sure that the air-loss rate per minute is not greater than
After you've connected your tractor to a trailer, you should test the trailer service brakes by applying
How can you tell how much air pressure is in the service reservoirs?
How can you tell if you have cross-connected the supply line and the service (control) line on a tractor-trailer with air brakes?
When adjusting a manual slack adjuster, how can you tell whether you are turning the adjusting bolt in the correct direction?
When using the applied stroke method to check pushrod stroke, how much pressure should you apply to the service brakes?
How often should you inspect your vehicle?
If 40 psi of pressure is applied to a brake chamber diaphragm of 30 square inches, the maximum force exerted would be
Which of the following are major components of the air supply circuit?