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View All Plans- Based on 2025 NB commercial driver's licence manual
- Updated for May 2025
FREE NB Air Brake Practice Test 1
In New Brunswick, some requirements for a commercial driver’s licence (Class 1, 2, 3, or 4) and some for an air brake endorsement depend on the class of licence you’ll be applying for.
All applicants for a commercial driver’s licence must be at least 18 years old, hold a Class 5 driver’s licence, pass a medical exam and a vision test, and pass a general knowledge test on the theory of commercial driving. If you are applying for an Air Brake Endorsement on a Class 2 or 3 licence (this endorsement is unavailable for Class 4), you must also complete an approved Air Brakes course and pass a separate Air Brake knowledge test. For Class 1, this endorsement is mandatory. The general knowledge test for Class 1 includes test questions on air brakes, so a separate air brake knowledge test is not required. All air brake test questions are based on the official New Brunswick Air Brake Manual.
For Classes 1 through 3, passing the general knowledge test will entitle you to a commercial learner’s licence, which will allow you to practice commercial driving under supervision. Class 4 applicants can practice commercial driving with their Class 5 licence.
When you’re ready, you can schedule a road test for your commercial driver’s licence. However, if you’re applying for a Class 1 licence, you must complete Mandatory Entry-Level Training (MELT) before taking the road test. MELT for Class 1 includes training in air brakes. If you’re going for an air brake endorsement for Class 2 or 3, be sure to complete an approved Air Brake course before taking the knowledge 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 1 licence or a Class 2 or 3 licence with a planned air brake endorsement, you must take the road test in a vehicle equipped with air brakes.
Unfortunately, neither reading the official Air Brake Manual nor taking a short Air Brake course can ensure you’ll pass the Air Brakes knowledge test on your first try. But our knowledge test preparation program does!
This is the first of our nine New Brunswick Air Brakes Practice Tests. It includes 35 multiple-choice questions on air brakes. All questions are up to date as of May 2025 and based on the official Air Brake Manual.
If you get stuck on a practice question, you can ask our AI Assistant to discuss the question further, 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.
- Perfect for first-time and renewal commercial applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
More resources
- Alberta: Test 1 / Test 2
- British Columbia: Test 1 / Test 2
- Manitoba: Test 1 / Test 2
- New Brunswick: Test 1 / Test 2
- Newfoundland and Labrador: Test 1 / Test 2
- Northwest Territories: Test 1 / Test 2
- Nova Scotia: Test 1 / Test 2
- Nunavut: Test 1 / Test 2
- Prince Edward Island: Test 1 / Test 2
- Quebec: Test 1 / Test 2
- Saskatchewan: Test 1 / Test 2
- Yukon: Test 1 / Test 2
- 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 leakage rates per minute after the initial drop are
- 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?
- Which of the following are major components of the air supply circuit?
- Wedge brakes are designed to be
- Where are the air brake chambers located?
- What does an ABS system do?
- When you are going at twice the speed, your service brakes will need to work _________ to stop your vehicle.
- 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?
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.
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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