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 - Quiz 4

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

Question 1 of 30

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

Question 2 of 30

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

Question 3 of 30

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

Question 4 of 30

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

Question 5 of 30

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

Question 6 of 30

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

Question 7 of 30

What does a kPa stand for?

Question 8 of 30

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

Question 9 of 30

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

Question 10 of 30

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

Question 11 of 30

What absorbs the heat produced by friction?

Question 12 of 30

Friction produces what?

Question 13 of 30

Braking distance is defined as:

Question 14 of 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 _________.

Question 15 of 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.

Question 16 of 30

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

Question 17 of 30

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

Question 18 of 30

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

Question 19 of 30

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

Question 20 of 30

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

Question 21 of 30

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

Question 22 of 30

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

Question 23 of 30

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

Question 24 of 30

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

Question 25 of 30

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

Question 26 of 30

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

Question 27 of 30

What are the two most common slack adjuster problems?

Question 28 of 30

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

Question 29 of 30

What is the best way to avoid major breakdowns?

Question 30 of 30



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.