Air brake systems are essential safety features on heavy-duty vehicles in Newfoundland, Canada.


Air Brake Test 03

1 / 30

After a long mountain drive, what is the best way to park if your vehicle has spring parking brakes?

2 / 30

Which of the following vehicles would require checking the hydraulic fluid level in the reservoir as part of the pre-trip check?

3 / 30

On a combination unit, the governor should place the compressor in the unloading stage between ___ psi minimum and ___ psi maximum.

4 / 30

One kilogram is equal to how many pounds?

5 / 30

For a combination unit, during what part of the pre-trip check do you ensure that the reservoir air pressure builds from 50 to 90 psi within three minutes?

6 / 30

During the '_______' stage, the compressor is able to cool.

7 / 30

Discounting self-lubricated compressors, how are compressors usually lubricated?

8 / 30

If an air-actuated hydraulic brake system was to lose its air supply, the vehicle would have no service brakes. Only the __________ would be operating.

9 / 30

In a dual air brake system, if one circuit develops a leak, the other circuit would be protected from air pressure loss by the __________________.

10 / 30

When checking for reservoir air leakage for a single unit, after making a full brake application with the foot valve and holding it the air pressure gauge reading should not drop more than __ psi per minute.

11 / 30

When conducting a compressor and warning device check for a single unit, warning device(s) must operate to __ psi or higher.

12 / 30

If a brake is out of adjustment and there is not enough reserve stroke of the push rod travel to compensate for drum expansion, this will cause ________.

13 / 30

What is used to mark where the push rod enters the brake chamber when determining whether an S-cam brake with manual slack adjusters requires adjustment?

14 / 30

What is the upward motion of the piston that compresses the air in the cylinder known as?

15 / 30

When inspecting brake adjustment on a single unit, the slack (push rod travel) should be within how many inches within manufacturer's specifications?

16 / 30

Choose the correct order of steps for the compressor and warning devices check as part of a single unit pre-trip air brake inspection.

17 / 30

What protects the wet reservoir from becoming over pressurized?

18 / 30

An air dryer may be installed between the ________ and the ________ to help remove moisture from the compressed air.

19 / 30

At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra _______ brake drum indicates that you have _____ adjusted it.

20 / 30

One metre is equal to how many yards?

21 / 30

One gram is equal to how many ounces?

22 / 30

What should be done to parked trailers without spring parking brakes to prevent a possible runaway?

23 / 30

Which of the following does not usually have a pressure gauge?

24 / 30

How often do automatic slack adjusters need to?

25 / 30

What does the acronym psi stand for?

26 / 30

For a combination unit, during what part of the pre-trip check do you ensure that the air brake glad hands and trailer electrical cord is connected properly?

27 / 30

In an air-boost hydraulic brake system what is used to intensify the hydraulic pressure generated by the master cylinder?

28 / 30

What would be the psi if 50 pounds were being forced onto 2 square inches?

29 / 30

Choose the correct order of steps to secure a vehicle as part of a single unit pre-trip air brake inspection.

30 / 30

Can the trailer brake hand valve be used for parking?

Your score is


These systems are designed to provide efficient and reliable braking power to commercial trucks and buses, ensuring that drivers can safely control their vehicles and avoid accidents. In Newfoundland, air brake systems are subject to rigorous testing and regulation by the province’s Ministry of Transportation and Infrastructure. Commercial drivers must pass a comprehensive air brake test before receiving their license to operate a heavy-duty vehicle. This test includes hands-on training and evaluation of the driver’s understanding of air brake principles, maintenance, and operation. The safety of drivers and passengers in Newfoundland is paramount. The rigorous air brake testing and regulation exemplify the province’s commitment to ensuring public road safety.

There are two types of Air Brake Endorsement:
Type 9 – Air brake endorsement without brake adjustment certification.
Type 9a – Air brake endorsement with brake adjustment certification. has prepared this Air Brake practice test to assist drivers in understanding an air brake system’s basic operation and function. Requirements for Air Brake Endorsement are:

1) Must complete an Air Brake Written Test

2) Must complete an Air Brake Practical Test.

This endorsement permits the holder to drive vehicles equipped with air brakes in the class of vehicle for which the driver is licensed.

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