Air brake systems are a crucial aspect of road safety in Newfoundland, Canada. These brakes are designed to slow, stop, and hold large vehicles or combinations of vehicles, such as tractor-trailers, buses, and heavy-duty trucks.


Air Brake Test 04

1 / 30

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

2 / 30

What absorbs the heat produced by friction?

3 / 30

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

4 / 30

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

5 / 30

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

6 / 30

What are the two most common slack adjuster problems?

7 / 30

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

8 / 30

What is the best way to avoid major breakdowns?

9 / 30

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

10 / 30

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

11 / 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.

12 / 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 _________.

13 / 30

Braking distance is defined as:

14 / 30

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

15 / 30

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

16 / 30

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

17 / 30

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

18 / 30

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

19 / 30

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

20 / 30

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

21 / 30

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

22 / 30

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

23 / 30

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

24 / 30

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

25 / 30

What does a kPa stand for?

26 / 30

Friction produces what?

27 / 30

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

28 / 30

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

29 / 30

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

30 / 30

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

Your score is


In Newfoundland, air brake tests are mandatory for anyone who wishes to operate any of these vehicles on the road. The test ensures that the air brake system is working correctly and that drivers understand how to operate it. Additionally, the Newfoundland government enforces strict regulations regarding air brake systems’ maintenance and inspection to ensure optimal safety on the road. These regulations aim to prevent accidents, injuries, and fatalities caused by poorly maintained or faulty air brakes. With these measures in place, Newfoundland’s air brake system standards are vital in promoting transportation safety in the region.

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.