Air brake systems are an integral part of commercial vehicles in Newfoundland, Canada. 


Air Brake Test 01

1 / 30

To stop a vehicle in 1/10 the time it took to accelerate would require a stopping force of __ times the acceleration force.

2 / 30

In a spring parking brake system, the brakes are applied by _____ pressure and retracted by ______ pressure.

3 / 30

All compressor reservoirs must be drained ______, in order to avoid excess water collection.

4 / 30

Which of the following can result in a brake system's automatic slack adjuster not maintaining proper slack?

5 / 30

Which of the following is a circular container divided in the middle by a flexible diaphragm?

6 / 30

A spring parking brake system can also act as ____________.

7 / 30

Braking at highway speed causes brake drum _______ due to heat, which in turn requires _____ push rod travel to maintain the same braking force.

8 / 30

The force that resists movement between two surfaces in contact with each other:

9 / 30

A reservoir's safety valve is normally set at ______.

10 / 30

A manual front brake limiting valve is useful in what type of conditions?

11 / 30

The compressor must be able to build reservoir air pressure from _______ within three minutes, otherwise the compressor requires servicing.

12 / 30

What component of an air brake system prevents air from moving backwards in the system toward the compressor?

13 / 30

Which of the following uses air pressure to assist brake force but does not require an air brake endorsement on your licence in order to operate?

14 / 30

What type of brake assembly uses a 'power screw'?

15 / 30

When a manual front brake limiting valve is activated, when applying air pressure to the front brakes it is reduced to __ percent of the application air pressure being delivered to the rear brake chambers.

16 / 30

What is the cause of accumulated sludge at the bottom of a reservoir?

17 / 30

The time it takes from the moment a hazard is recognized to the time the brake is applied is known as:

18 / 30

Which of the following controls the minimum and maximum air pressure in the air brake system by controlling when the compressor pumps air?

19 / 30

A foot valve ______________.

20 / 30

Most brake linings work best around:

21 / 30

The braking force required to stop a vehicle varies directly with its _______________.

22 / 30

If an air brake system's compressor is struggling to build 90 psi of air pressure within 3 minutes, which of the following is most likely the problem?

23 / 30

When the driver releases the foot valve treadle and the air in the brake chambers is allowed to exhaust through the ______, releasing the brakes.

24 / 30

What part can be installed on long wheel base vehicles to allow the brakes to release quickly and fully by discharging the application air near the brake chambers?

25 / 30

The first reservoir after the compressor is known as the __________.

26 / 30

The distance the ______ of the foot valve is depressed by the driver determines the air pressure that will be applied in order to operate the brakes.

27 / 30

If compressed air of 120 psi acts on a diaphragm of 45 square inches, how much force is produce?

28 / 30

The foot valve is usually located closer to the ________. The longer the distance from the foot valve to the rear chambers, the ______ time it will take before the rear brakes apply.

29 / 30

Levers and air pressure give brakes:

30 / 30

Brake chambers and slack adjusters ______________________.

Your score is


The Newfoundland Air Brake Test ensures that all vehicles equipped with air brakes are properly maintained and functioning efficiently. This test is mandatory and required for drivers operating commercial vehicles. The air brake system in Newfoundland is designed to maintain the vehicle’s safe speed, stability, and stopping distance. The system comprises a compressor, storage tank, air brake hoses, valves, and brake shoes. An air pressure gauge monitors the air pressure in the system, and to pass the test, the air pressure must meet the requirements as set out in the regulations. The safety and reliability of the air brake system are paramount in ensuring the safe transport of goods and passengers in Newfoundland, and the air brake test plays a vital role in achieving this goal.

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.