Ontario Air Brake Test 01

Taking the Ontario air brake practice test is a crucial step towards becoming a licensed commercial driver in the province. The test evaluates your knowledge of the mechanics and operation of air brake systems, which are essential for the safe operation of large commercial vehicles such as trucks and buses.

1 / 30

What happens when brake drums overheat?

They become thicker

They thin out

Nothing

They expand to the point where they may not even contact the shoe

2 / 30

Cut-out pressure is normally how much above the cut-in pressure?

30 to 35 psi

10 to 15 psi

20 to 25 psi

5 to 10 psi

3 / 30

What powers the air compressor?

Nature air flow outside the vehicle

A fan

The engine

A generator

4 / 30

Air compressors are designed to run whenever...

The spring brakes are activated

The engine is running

There is a brake fade or failure

Whenever the driver flips the switch

5 / 30

The actual air brake system pressure range must never be lower than...

90 psi

110 psi

60 psi

80 psi

6 / 30

Brakes convert the energy of a moving vehicle into what?

Nothing

Sludge

Heat

Air

7 / 30

Other than air brakes, what is not another type of braking system is used on commercial vehicles?

Air parking brakes

Air-over hydraulic brakes

Cable brakes

Hydraulic brakes

8 / 30

The air compressor draws in air at normal pressure and does what with it?

Forces it into larger containers for future use

None of the above

Forces it into a much smaller space, causing the pressure of the air to increase

Pushes it into air hoses

9 / 30

When brakes overheat due to overuse or improper adjustment, what is it advisable to do?

Use the engine brakes for a while

Stop and allow them to cool before proceeding

Turn on the brake fan

None of the above

10 / 30

When you press the brake pedal, compressed air must travel from one part of the system to another. What ensures the air moves through the system as quickly as possible?

All of the above

Special valves

A compressor

A governor

11 / 30

Which statement is false? Too much heat in the brake pads can create what?

Brake failure

Fire

Quick stops

Brake fade

12 / 30

There is a split-second delay in brake reaction from the moment you apply or release the brake pedal. Is this common?

It occurs in older systems

It occurs in all air brake systems

It only occurs with smaller air hoses

It only occurs with tandem trailers

13 / 30

When you press the brake pedal with drum brakes, what happens?

The brake shoes move up toward the centre of the drums

The brake shoes press outward against the drum's surface

The drums move to make contact with the shoes

None of the above

14 / 30

The normal pressure range of an air brake system is determined by the points where the air compressor...

Turns off for a period of 30 minutes

Turns on and turns off

Turns off for a period of 5 minutes

Turns on and stays on

15 / 30

To stop a moving vehicle, the brake shoes or pads exert pressure on the brake drums or rotors and the resulting friction produces heat that is absorbed and dissipated where?

Into the air lines

Through special ports

None of the above

By the brakes and their components

16 / 30

Why are air brakes used on heavy commercial vehicles?

They are cheaper to maintain

They fit better on the larger wheel hubs

They can develop and transmit high mechanical forces over great distances using simple components and connections

They come with the manufacturer

17 / 30

Do you need to have an air brake endorsement on your driver's licence to drive a vehicle with air-over-hydraulic brakes in Ontario?

Yes

Only if the gross weight is more than 4,600 kg

If traveling more than 160 km from your home base

18 / 30

Normal air brake system pressure range is around...

100 to 120 psi

80 to 90 psi

70 to 90 psi

130 to 140 psi

19 / 30

Which type of vehicles use air-over hydraulic brakes

Mainly on medium-duty commercial vehicles

All of the above

With tandem trailers

On heavy duty vehicles

20 / 30

Can brake fluid be compressed like air in air brake systems?

Just with buses

Yes

Only with a stronger brake cylinder

21 / 30

When using disc brakes, what happens when you press the brake pedal?

The shoes press against the pads

The shoes press against the inside of the disc

The pads press toward each other, clamping against both sides of the rotor's surface

The discs press against the drums

22 / 30

What's the purpose of the air compressor?

Cools the engine

Produces air for the braking system

Produces air for the tires

Nothing

23 / 30

Abnormal pressure readings should always be verified by...

The carrier

A technician

All of the above

The driver

24 / 30

When you are applying for an Air Brake Endorsement on your license, what letter accompanies your license?

25 / 30

What is another phrase for when the air compressor turns off?

Cut-in pressure

Cut-up pressure

Cut-out pressure

Cut-down pressure

26 / 30

Do you need an air brake endorsement on your driver's licence to drive a vehicle with air parking brakes?

Only with school buses

Yes

Only with tow trucks

27 / 30

What happens if there is a single malfunctioning brake?

The vehicle stops quickly

All the brakes begin the fail

The emergency brakes kick in

It will increase the work of all the others, causing them to overheat quickly and possibly fail too

28 / 30

If you are driving a vehicle equipped with air brakes, do you need to understand how an air brake system works and how it compares to other vehicle braking systems?

In certain municipalities

Only if company policy

Yes

29 / 30

What is another phrase for when the air compressor turns on?

Cut-down pressure

Cut-up pressure

Cut-out pressure

Cut-in pressure

30 / 30

What is another name for the brake hardware used in heavy commercial vehicles?

Principle brakes

Foundation brakes

Main brakes

Primary brakes

Your score is

The test consists of 30 multiple-choice questions, covering topics such as air brake system components, maintenance, safety, and emergency procedures. The Ontario Ministry of Transportation administers it and offers it for online or in-person testing at designated centers. To pass the test, you must score at least 80%. Your certification is valid for two years. It’s essential to thoroughly study and prepare for the test to ensure proficiency in air brake operation and maintenance, which contributes to road safety for all drivers. Be sure to check out this section dedicated to the Ontario Air Brake Practice Test, which is designed to cater to your specific needs.

Ontario Air Brake Test 01

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