FREE NB Air Brake Practice Test 1 2025
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.
- 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?
