Air brakes are an essential component of any commercial vehicle operating in Manitoba, Canada. These brakes operate using compressed air to apply pressure to the brake pads, thus bringing the vehicle to a stop.


Air Brake Test - Quiz 4

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

Question 1 of 30

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

Question 2 of 30

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

Question 3 of 30

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

Question 4 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 5 of 30

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

Question 6 of 30

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

Question 7 of 30

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

Question 8 of 30

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

Question 9 of 30

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

Question 10 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 11 of 30

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

Question 12 of 30

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

Question 13 of 30

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

Question 14 of 30

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

Question 15 of 30

What absorbs the heat produced by friction?

Question 16 of 30

Braking distance is defined as:

Question 17 of 30

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

Question 18 of 30

What is the best way to avoid major breakdowns?

Question 19 of 30

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

Question 20 of 30

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

Question 21 of 30

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

Question 22 of 30

What does a kPa stand for?

Question 23 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 24 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 25 of 30

What are the two most common slack adjuster problems?

Question 26 of 30

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

Question 27 of 30

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

Question 28 of 30

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

Question 29 of 30

Friction produces what?

Question 30 of 30



In Manitoba, drivers must pass an air brake test before obtaining a commercial driver’s license. This test ensures that drivers understand how to properly operate and maintain air brake systems, which is crucial for their safety and the safety of others on the road. Additionally, Manitoba requires annual air brake inspections to ensure all commercial vehicles have functioning air brakes. These inspections help prevent accidents caused by faulty braking systems. Overall, air brakes are a vital aspect of commercial vehicle operation in Manitoba, and they play a critical role in keeping the province’s roads safe and secure for everyone. 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.