Air brakes are an essential part of any commercial vehicle’s braking system, and New Brunswick, Canada has strict rules and regulations when it comes to air brake testing.


Air Brake Test 04

1 / 30

The amount of force available at the push rod is consistent out to ____ inches of stroke.

2 / 30

Normally on an S-cam brake with automatic slack adjustment, ________ brake applications of ________ psi per day will keep the brakes properly adjusted.

3 / 30

A relay valve has two uses. Which of the following is one of them?

4 / 30

What is a reason a medium sized vehicle would use air over hydraulic brakes?

5 / 30

What are the two most common slack adjuster problems?

6 / 30

The electronic engine control is activated automatically by the ATC if all the wheels begin to slip. What effect does this have?

7 / 30

The ________ the air supply is kept, the ______ chance of brake problems.

8 / 30

A vehicle carrying a load of 20,000 kg at 20 km/h is brought to a stop in 45 metres with normal application of the brakes. If this same vehicle carried 40,000 kg at 40 km/h, it would require ____ times the braking force to stop the vehicle in 45 metres.

9 / 30

Which of the following is NOT a component of an air brake system?

10 / 30

On spring brake systems, during full brake application, compounding of the force applied on the slack adjusters and linkage can be said to be a combination of two forces: the force applied by the _________ and the _________.

11 / 30

On a combination vehicle, what is the first step in a tractor protection valve check?

12 / 30

Which of the following is considered the 'brain' of an anti-lock braking system?

13 / 30

What does a kPa stand for?

14 / 30

Braking distance is defined as:

15 / 30

Friction produces what?

16 / 30

Air that is squeezed into a much smaller space than it normally would occupy is said to be ________.

17 / 30

On spring operated parking brakes, during normal operation, air pressure _________ the spring, holding it ready for parking or emergency braking.

18 / 30

Ultimately, it is the _______ responsibility to ensure that brakes are adjusted correctly.

19 / 30

The ________ of the drum brakes determines the amount of _____ they are able to absorb and dissipate into the atmosphere.

20 / 30

Which of the following is NOT true about automatic traction control?

21 / 30

What methods can the driver use to stay aware of the condition of the vehicle's braking system?

22 / 30

What is the function of a 'spitter' valve on a reservoir?

23 / 30

What is the best way to avoid major breakdowns?

24 / 30

What will a tractor protection valve with a broken return spring cause?

25 / 30

For a vehicle to move along the highway, an internal combustion engine must convert its _____ energy into ______ energy.

26 / 30

At a truck stop before a downgrade, what needs to be checked before continuing to drive?

27 / 30

Which of the following is NOT a component of a spring parking brake system?

28 / 30

What absorbs the heat produced by friction?

29 / 30

The _______ adjusts the free play in the linkage between the push rod and the brake shoes.

30 / 30

A brake chamber is a circular container divided in the middle by a flexible ________.

Your score is


The province annually conducts air brake tests on commercial vehicles to ensure their safety on the road. These tests are thorough and cover several aspects of the brake system, including the air compressor, valves, hoses, and reservoirs. Furthermore, the province has strict regulations about who can operate a vehicle with air brakes – only those who have completed the necessary training and obtained an air brake endorsement can operate these vehicles. These measures ensure that the people of New Brunswick can travel safely on the province’s roads, knowing that every commercial vehicle with air brakes has been thoroughly tested and maintained.

Before learning to drive a Class 1, Class 2, Class 3, or Class 4 vehicle, you must get authorized instruction in the class of vehicle you want to be licensed in. For each section of these practice tests, we have multiple practice tests. Requirements for Air Brake Endorsement are 1) Must complete an Air Brake Written Test 2) Must complete an Air Brake Practical Test.

To successfully prepare, consider utilizing these exams and the official New Brunswick Air Brake Manual to your advantage. The more knowledge you can attain, the better it will be for you once you return to the SNB office to take the air brake license written knowledge test.