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Air Brake Test - Quiz 4

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

Question 1 of 30

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

Question 2 of 30

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

Question 3 of 30

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

Question 4 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 5 of 30

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

Question 6 of 30

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

Question 7 of 30

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

Question 8 of 30

Friction produces what?

Question 9 of 30

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

Question 10 of 30

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

Question 11 of 30

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

Question 12 of 30

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

Question 13 of 30

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

Question 14 of 30

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

Question 15 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 16 of 30

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

Question 17 of 30

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

Question 18 of 30

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

Question 19 of 30

What does a kPa stand for?

Question 20 of 30

What are the two most common slack adjuster problems?

Question 21 of 30

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

Question 22 of 30

What absorbs the heat produced by friction?

Question 23 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 24 of 30

What is the best way to avoid major breakdowns?

Question 25 of 30

Braking distance is defined as:

Question 26 of 30

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

Question 27 of 30

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

Question 28 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 29 of 30

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

Question 30 of 30


It is recommended that you take a practice test before you take the actual written test. Please note, however, that this is not the actual test, and you will not receive your license if you pass this sample practice test. If you’re getting your commercial licence, you've come to the right place.

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.

This Air Brake practice test has been prepared by Drivingtest.ca to assist drivers in understanding the basic operation and function of an air brake system.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 licenced.

In order to successfully prepare, consider utilizing these exams and 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 make your way back into the licence office to take the air brake licence written knowledge test.