ONTARIO AIR BRAKE PRACTICE TEST 01

Preparing for the Ontario Air Brake test can be a daunting task, but with our free practice tests, you can gain the confidence and knowledge needed to pass the exam on your first try.

These practice tests include questions and scenarios that are similar to those you will encounter on the actual test.

Ontario Air Brake Test 01

1 / 30

Spring brakes are applied when...?

Air pressure builds up in the brake chamber

Air pressure reduces in the compressor

Air pressure builds up in the wet tank

Air pressure leaves the brake chamber

2 / 30

Where will you find air brake chambers?

On each wheel

On the rear wheels

To the compressor

On the front wheels

3 / 30

Normal air brake system pressure range is aroundâ€¦?

138 to 173 kPa (20 to 25 psi)

690 to 828 kPa (100 to 120 psi)

1035 to 1135 kPa (150 to 164 psi)

380 to 420 kPa (55 to 60 psi)

4 / 30

Which is the only one of these that is part of a disc brake system?

Drum

Rotor

Shoe

Lining

5 / 30

Where will you find the air pressure gauge for an air brake system?

Underneath the vehicle hood

Attached to the brake discs

On the vehicle dashboard

Next to the compressor

6 / 30

In an air brake system, what does the governor do?

Regulates the amount of air released to the brakes

Regulates the revolutions of the engine

Regulates the speed of your vehicle

Regulates the air pressure

7 / 30

Under the Ontario Highway Traffic Act, an air brake system should never drop below what pressure?

617 kPa (89 psi)

334 kPa (48 psi)

436 kPa (63 psi)

552 kPa (80 psi)

8 / 30

In a normal braking situation, most modern air brake vehicles will use automatic valves to do what?

Increase the pressure at the front wheels

Reduce the pressure at the rear wheels

Reduce the pressure at the front wheels

Increase the pressure at the rear wheels

9 / 30

A braking system works by converting mechanical energy into what?

Water

Heat

Air

Gas

10 / 30

Moisture in an air brake system can be dangerous for what reason?

All of these

It can cause corrosion

It can freeze in cold temperatures

It can reduce the volume of air

11 / 30

If an air brake system has an air dryer, where will it be found?

In any of these locations

Between the compressor and the supply tank

Between the second tank and the third tank

Between the supply tank and the second tank

12 / 30

The spring brake subsystem is designed for which of these?

Parking and emergencies

Normal stopping

All of these

Heavy skidding

13 / 30

When draining tanks on an air brake system, which tank should be drained first?

The third air tank

The last air tank

The supply tank

The second air tank

14 / 30

The supply tank for an air brake system does what?

Adds moisture to the air

Collects only oil from the air

Collects only moisture from the air

Collects moisture and oil from the air

15 / 30

Which of these vehicles is most likely to have air brakes?

A large sedan

A school bus

A pickup truck

A motorcycle

16 / 30

Why do air brake systems have dual-service tanks?

For power

For efficiency

For safety

For economy

17 / 30

At what pressure do safety valves on air brake systems normally open?

1235 kPa (179 psi)

1135 kPa (164 psi)

935 kPa (135 psi)

1035 kPa (150 psi)

18 / 30

The air tanks for an air brake system can be found where?

On top of the vehicle cab

On top of the engine

Under or around the frame of the vehicle

Above the rear license plate

19 / 30

In an air brake system, the service brake subsystem is used for what?

All of these

Normal braking

Emergency braking

Parking

20 / 30

As you press down on the brake pedal, what happens to the valve which is attached to it?

It remains the same

It opens wider

Any of these depending how hard you press

It starts to narrow

21 / 30

A warning device must alert the driver if the pressure in the air brake system falls to what level?

420 kPa (60 psi)

380 kPa (55 psi)

320 kPa (46 psi)

360 kPa (52 psi)

22 / 30

Which of these persons can perform brake readjustments on manual and automatic slack adjusters?

Drivers licensed to operate air brake vehicles

Certified technicians

Regular mechanics

Vehicle owners

23 / 30

Which of these can you expect from an air brake system that you will not get in a hydraulic brake system?

Less efficient braking

More efficient braking

More wheel lock

A split second delay

24 / 30

Many vehicle manufacturers recommend draining moisture and oil from a vehicle's air tanks at what interval?

Daily

Weekly

Hourly

Monthly

25 / 30

Why is it important for you to know where compressed air from the air brake system on your vehicle exhausts?

Because it can be dangerous

So that you can check their pressure

So that you can clean them

It isn't particularly important

26 / 30

If you are driving and a warning tells you that your air pressure is low, what should you do?

Alert the mechanics at the end of your journey

Proceed at a low speed

Have it checked at the next garage

Stop immediately

27 / 30

The air compressor for an air brake system draws its power from where?

The vehicle's engine

The vehicle's fan intake

The vehicle's battery

The vehicle's wheels

28 / 30

Spring brakes will normally start to apply when system pressure drops below...?

614 kPa (89 psi)

414 kPa (60 psi)

314 kPa (45 psi)

514 kPa (74 psi)

29 / 30

In an air brake system, what purpose does the alcohol evaporator serve?

To increase pressure

To prevent overheating

To prevent freezing

To slow the system down

30 / 30

The pushrod stroke is produced by compressed air entering...?

The compressor

The primary tank

The brake chamber

The wet tank

Your score is

Ontario Air Brake Practice Test

Our free Ontario Air Brake practice test questions and answers will prepare you to pass Ontario’s official Air Brakes knowledge test. To begin your career in trucking, you must obtain your Ontario Class A or Class D Truck Driver’s Licence. The appropriate CDL endorsements you will need are based on the type of trucking career you plan to pursue. To obtain these endorsements, you must complete a written knowledge test successfully. Making sure you are adequately prepared for your written knowledge test will prevent you from wasting time and money. Taking practice CDL tests is the best way to get ready.

Passing your air brake test doesn’t have to be a stressful experience. Follow this important tip, and you should pass the test without a problem.

Start Preparing Early – Don’t try to cram the night before. Give yourself a few weeks to study the materials, such as this Ontario air brake practice test. Trying to learn all the information in a couple of days will only cause unneeded stress and anxiety during test time. Relax, take your time, and study at a comfortable pace.