All your missed questions are saved automatically for extra practice.
Already in Your Challenge Bank!™
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
Adding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 270 exam-like questions, a Pass Guarantee, personalized study plans, and more.
Based on 2025 BC commercial driver's licence manual
Updated for August 2025
BC Air Brake Test 12
Driving through busy Vancouver or navigating the Kootenays requires skill and understanding of air brakes. Test 12 with 50 questions is here to prepare you for the Air Brake test, aligned with the latest BC commercial driver's manual.
Perfect for first-time and renewal commercial applicants, and those adding endorsements
Triple-checked for accuracy
About this test
5 out of 5 • 1 votes
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 accumulates at the bottom of the supply reservoir in an air brake system?
Why is an air dryer needed in an air brake system?
Upon driver releasing the treadle in an air brake system, to where does the air get directed?
What influences the quantity and size of reservoirs on a vehicle with an air brake system?
What function does the slack adjuster perform in an air brake system?
What does it mean if the safety valve must relieve pressure in an air brake system?
Is it necessary to inspect automatic reservoir drain valves every day in an air brake system?
Where would one typically find the brake chamber mounted in a vehicle?
Where does the pressurized air go as the compressor's piston approaches its peak stroke in an air brake system?
What is an alternate term for the supply reservoir in an air brake system?
What function does the heater element in the purge valve perform in an air dryer?
How is the push rod linked to the slack adjuster in an air brake system?
What could be a possible outcome if sludge accumulated in the bottom of the air brake system's tank?
What circumstances would prevent a compressor from being able to increase air pressure from 50 to 90 psi within three minutes?
At what pressure is a safety valve normally set in an air brake system?
What happens to the heated air from the compressor as it cools down in the supply reservoir?
What is the crank arm-type lever the push rod is connected to known as in an air brake system?
What causes the air in the air brake system's cylinder to compress?
How is a brake chamber in an air brake system separated internally?
Whereabouts in the air brake system would one typically install an air dryer?
What purpose does a safety valve serve in an air brake system?
What distinguishes the front axle brake chambers from the rear axle brake chambers in an air brake system?
How frequently should the tanks in an air brake system be drained?
What happens if there's a leak in the diaphragm of a brake chamber in the air brake system?
What's another term for an automatic reservoir drain valve in an air brake system?
What is the reason for installing the brake chamber and slack adjuster on the backing-plate of a front axle assembly?
What are some advantages of air-over-hydraulic brake systems?
Who is usually responsible for manual adjustment of wedge brakes?
Which are not usually found in commercial vehicles?
Which of these factors would not cause an automatic slack adjuster to fail in maintaining the proper slack?
How can drivers track service tank air pressures?
What air brake system doesn't necessitate an air brake endorsement?
What's a type of low-pressure warning device used predominantly in old vehicles?
Which statement is incorrect? Air over hydraulic brake systems were created for medium-weight vehicles because...
What psi triggers the low-pressure indicator light or alarm due to overuse or leaks?
Is it necessary to check automatic slack adjusters?
An air-over-hydraulic brake system is most alike to which system?
What must the low-pressure warning system comprise of?
What does the stoplight switch do?
What does the air line from the foot valve to the relay valve function as?
When the warning system is triggered, what action must a driver take?
Why is a quick release valve necessary in the braking system?
Can a device showing application air pressure be added to the dashboard when brakes are applied?
What should be the maximum angle between the push rod and the arm of the slack adjuster when brakes are fully applied?
What determines the amount of heat the brakes can absorb and radiate into the surrounding air?
Which is false? Extremely unreliable brake performance can come from...
When the slack adjusters turn the S-cams, what happens?
On manual slack adjusters, the adjusting bolt is turned until the brake linings touch the drums and then backed off by how much?
Where is the one-way check valve installed?
Which of these could cause brake fading or the reduction in braking power occur?
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 ZakhareuskiUpdated 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.
Our Premium Membership comes with a Pass Guarantee (30-day access and longer). If you successfully complete all the practice tests for your province/territory, we promise you a passing grade on your official written knowledge test or we'll refund your money. Your most recent completion of all the tests should be not earlier than 30 days before your exam date.
To claim
Just send us an email with your full name (must match the name and email address used for your purchase at Tests.ca) within 30 days from the purchase of your Premium membership.
What happens next
We'll check your account to make sure you've successfully completed all practice tests for your state. Once that is confirmed, we'll issue a full refund (you'll receive a separate email confirmation).
