Air brakes are a critical component in the safe operation of commercial vehicles in Manitoba, Canada.


Air Brake Test 03

1 / 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.

2 / 30

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

3 / 30

What does the acronym psi stand for?

4 / 30

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

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

One metre is equal to how many yards?

7 / 30

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

8 / 30

One gram is equal to how many ounces?

9 / 30

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

10 / 30

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

11 / 30

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

12 / 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?

13 / 30

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

14 / 30

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

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

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.

17 / 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.

18 / 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.

19 / 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 __________________.

20 / 30

Can the trailer brake hand valve be used for parking?

21 / 30

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

22 / 30

One kilogram is equal to how many pounds?

23 / 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 ________.

24 / 30

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

25 / 30

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

26 / 30

How often do automatic slack adjusters need to?

27 / 30

What protects the wet reservoir from becoming over pressurized?

28 / 30

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

29 / 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?

30 / 30

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

Your score is


Since the introduction of the mandatory air brake endorsement in 1996, all drivers of commercial vehicles with air brakes must pass a practical and written test to receive this endorsement. The practical test evaluates the driver’s ability to conduct a pre-trip inspection of the air brake system, perform a brake check, and complete a controlled stop. The written test covers the theory and operation of air brakes, including the various components involved in the system and how they work together to slow and stop a vehicle safely. Furthermore, Manitoba government officials recognize the importance of keeping air brake training and endorsement requirements up to date with current industry standards. As such, Manitoba is one of the few jurisdictions in North America that has implemented mandatory air brake endorsement renewals for commercial drivers. By ensuring that drivers are knowledgeable and trained on air brake systems, Manitoba is proactively promoting road safety for all Manitobans. has prepared this Air Brake practice test to assist drivers in understanding an air brake system’s essential 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 vehicle class for which the driver is licensed.

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