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Air Brake Test - Quiz 1

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

Question 1 of 30

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

Question 2 of 30

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

Question 3 of 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.

Question 4 of 30

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

Question 5 of 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.

Question 6 of 30

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

Question 7 of 30

Levers and air pressure give brakes:

Question 8 of 30

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

Question 9 of 30

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

Question 10 of 30

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

Question 11 of 30

A foot valve ______________.

Question 12 of 30

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

Question 13 of 30

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

Question 14 of 30

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

Question 15 of 30

Most brake linings work best around:

Question 16 of 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?

Question 17 of 30

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

Question 18 of 30

Brake chambers and slack adjusters ______________________.

Question 19 of 30

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

Question 20 of 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?

Question 21 of 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.

Question 22 of 30

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

Question 23 of 30

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

Question 24 of 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.

Question 25 of 30

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

Question 26 of 30

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

Question 27 of 30

A spring parking brake system can also act as ____________.

Question 28 of 30

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

Question 29 of 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?

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.