All your missed questions are saved
automatically for extra practice.
All your missed questions are saved
automatically for extra practice.
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.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All PlansTo be eligible for a commercial driver’s licence in Ontario, you must hold a Class G driver’s licence, pass a vision test, and pass a medical exam. Then you must pass a written commercial driver’s knowledge test on the theory of commercial driving. If you are applying for an Air Brake Endorsement, you must also pass a separate Air Brake knowledge test. This endorsement is mandatory for Class A, optional for Classes B through D, and unavailable for Classes E and F. The air brake test questions are based on the ON Official Air Brake Handbook.
Passing the general knowledge test will entitle you to a commercial learner’s permit, which will allow you to practice commercial driving under supervision.
When you’re ready, you can schedule a road test for your commercial driver’s licence. However, for a Class A licence, you must complete Mandatory Entry-Level Training (MELT) before taking the road test. For an Air Brakes endorsement, you must complete an MTO-approved Air Brakes course and pass an Air Brakes practical test before completing MELT (Class A) or taking the road test (Classes B through D). The Air Brakes practical test consists of a pre-trip inspection test and a brake function test.
You must take the road test in a vehicle that’s representative of the class of licence you’re applying for. For a Class A licence or another class of licence with a planned air brake endorsement, you must take the road test in a vehicle equipped with air brakes.
However, unlike reading the official Air Brake Handbook or taking a short Air Brake course, our Premium program guarantees you’ll pass the Air Brakes knowledge test – on your first try!
This is just the first of our fourteen Ontario Air Brakes Practice Tests. It includes multiple-choice questions on air brakes. All questions are up to date as of September 2025 and based on the official Air Brake Manual. If you get stuck on a practice question, you can ask our AI Assistant to rephrase the question, give you a hint, or answer your own questions about commercial driving. If you still miss the question, you’ll be shown the correct answer and an explanation.
Please take all this material seriously. As a commercial driver, you may be driving on Highway 17 with its steep hills, sharp turns and severe winter conditions, Highway 400 with heavy snows and black ice in winter, or Highway 401 with heavy traffic congestion. Knowing how to inspect, test, and use air brakes can be lifesaving.
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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.
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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.