Air brake systems are an essential safety feature on commercial vehicles in Newfoundland, Canada. The province of Newfoundland and Labrador requires all commercial drivers to complete an air brake endorsement course and pass a written and practical air brake test before operating these vehicles on public roads.


Air Brake Test - Quiz 2

Tractors and trailers _______ ABS can be connected to one another without affecting the operation of the ABS.

Question 1 of 30

When a brake diaphragm chamber bottoms out, the force reduces to ____.

Question 2 of 30

___________ must not be used to hold a parked vehicle that is left unattended. Loss of pressure will result in loss of brakes. Always set the __________.

Question 3 of 30

Which of the following is true of a basic dual air brake system?

Question 4 of 30

Which of the following negatively affect braking ability?

Question 5 of 30

Which of the following is a disadvantage of a control (service) line and foot and hand valve system?

Question 6 of 30

In regards to a dual air brake system, air taken from primary and secondary circuits through a two-way check valve is known as _________.

Question 7 of 30

Which of the following negatively affects braking ability?

Question 8 of 30

What are the two types of trailer supply valves? Choose the best answer.

Question 9 of 30

On vehicles equipped with ______ brakes it is possible to pump the brake pedal to compensate for brakes that are out of adjustment. This is not possible with a vehicle equipped with ___________ brakes.

Question 10 of 30

Which of the following can a tractor with a dual air brake and spring parking brakes system tow?

Question 11 of 30

On the pre-trip air brake inspection, you must ensure that the parking brake spring is not _______ or it will not expand and apply the brake.

Question 12 of 30

With automatic traction control, __________ is activated when the system detects a wheel slipping because the wheels operating on different surfaces such as one wheel on dry pavement and the other on ice.

Question 13 of 30

The effectiveness of diaphragm brake chambers drops off significantly if the stroke exceeds __% of its designed travel.

Question 14 of 30

If a relay emergency valve is mounted on the trailer reservoir and a loss of air pressure from the power unit service system occurs, what will automatically happen?

Question 15 of 30

What system reduces the potential of powering into a jackknife caused by wheel overspin during acceleration?

Question 16 of 30

When connecting the glad hands, start with the two gaskets together and the couplers at a ___ angle to each other.

Question 17 of 30

An ABS system keeps the wheel from skidding and increases vehicle stability and control during what type of conditions?

Question 18 of 30

A tractor protection valve is normally located near the _________.

Question 19 of 30

If the air pressure drops to a range between ______ psi, the trailer supply valve will close automatically by spring pressure, opening the exhaust port.

Question 20 of 30

Which of the following is capable of directing air flow into a common line from either of the foot valve or the hand valve?

Question 21 of 30

Which of the following is another term for a control (service) line?

Question 22 of 30

Which of the following is responsible for preventing automatic spring brake application if the trailer supply line has a gradual leak?

Question 23 of 30

___________ prevents total loss of air from the tractor if the trailer breaks away, or if the connecting air lines between tractor and trailer become separated or ruptured.

Question 24 of 30

Caging a spring parking brake is the same as...

Question 25 of 30

Which of the following is true in the case that there is air loss in one of the dual air brake system's circuits?

Question 26 of 30

A/n _______ is an electronic system that monitors wheel speed at all times and controls wheel speed while braking.

Question 27 of 30

Which of the following is a term that refers to the coupling device used to connect the control (service) and supply (emergency) lines of the trailer to the tractor?

Question 28 of 30

If the foot valve is supplying a higher application pressure than the hand valve, a two-way check valve will allow air flow from which source?

Question 29 of 30

$What would happen if a trailer that is not equipped with spring parking brakes were to separate from the tractor?

Question 30 of 30



The province’s Highway Traffic Act mandates this Air Brake System endorsement. It ensures that only qualified drivers are responsible for safely operating transport trucks, buses, and other large commercial vehicles. With these rigid safety standards, Newfoundland is a leader in promoting safe driving practices and reducing the risk of accidents on its roads. The air brake system in Newfoundland is treated with the utmost importance to ensure the safety of all road users, emphasizing the importance of well-trained and certified drivers.

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.