ON Air Brake Test 12
- 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 December 2024
This test is a Premium member exclusive. You'll get
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.
Ready for Ontario Commercial Air Brake Test 12? This test aims to prepare you on brake maintenance with 50 comprehensive questions. We've got you covered on everything you'll need to know for the official exam.
What to expect on the official exam
50
questions
40
correct answers to pass
80
passing score
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.
List of questions (classic view)
- Which of these could cause brake fading or the reduction in braking power occur?
- Where is a relay valve usually installed?
- What could be necessary to maintain adjustment in automatic brake adjusters?
- Who must guarantee that brakes are correctly adjusted?
- What is the one-way check valve's primary role in the brake system?
- What determines the efficiency of the spring parking brake?
- What is the purpose of an automatic limiting valve in an air brake system?
- What is important to do before disassembling spring parking brake chambers?
- How are spring brakes released?
- How can some spring parking brakes be discharged mechanically?
- Where can one typically find instructions on how to cage a spring parking brake?
- What is the functionality count for the relay valve in an air brake system?
- What is the end-point for the control line air in an air brake system?
- What is the risk associated with disassembling a spring parking brake unit?
- What component is fitted on the brake chamber to prevent debris from entering?
- What is an essential step to safely cage the parking brake spring?
- How is the caging of brakes accomplished?
- What can be achieved by installing a control valve in the cab and a front brake limiting valve on the front axle?
- When should you engage the spring parking brake after the brake drums have overheated?
- During a pre-trip air brake inspection, you must ensure that the parking spring brake is not what?
- What does the blue button on some air brake systems apply?
- Besides being a parking brake, the spring parking brake system also functions as what?
- What is referred to as compounding in the context of air brake systems?
- Which of these statements is not true about how quickly the spring brakes will stop the vehicle?
- What happens when the reservoir pressure drops to approximately 35 psi?
- Who should disassemble a spring brake chamber?
- Before a service brake application is made, where should parking brakes be positioned?
- When a heated brake drum begins to cool and contract, what might the pressure from the spring parking brake cause it to do?
- What does it mean to "cage" a spring in the context of air brake systems?
- What position should the control valve be set in for driving on dry road surfaces?
- What action allows reservoir air pressure to flow to the spring parking brake chambers?
- When using an automatic limiting valve, brake applications between 40 psi and 60 psi are reduced to what?
- What occurs to the parking brake spring during normal service brake operation?
- Is the setup of spring parking brakes and their pipe arrangements consistent across all vehicle air brake systems?
- Which of these statements is false about parking a vehicle with overheated brakes?
- What component in the glad hands prevents air from leaking out?
- What happens when the air pressure declines to a range between 20 and 45 psi?
- How many air lines typically lead to the tractor protection valve?
- What is the effect of opening the trailer supply valve?
- What are the alternative names for the trailer supply valve?
- What opens when the driver manually closes the trailer supply valve?
- What is the result of disconnecting the supply line between the tractor and trailer while the trailer is still charged?
- What alternative terminology is used to describe the application line?
- If the driver accidentally uses the hand valve without a trailer being connected, what occurs?
- What should be utilized to prevent dirt and water entry into the coupler and lines when the vehicle is used alone?
- Why should you avoid using the hand valve for parking a trailer?
- When the foot valve treadle is depressed by the driver, where is application air sent?
- Where is a relay emergency valve typically installed?
- In the context of tractor-trailer connection, what does "glad hands" refer to?
- When joining the glad hands, how should the two gaskets and couplers be positioned relative to each other?