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

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

The vehicle's battery

The vehicle's engine

The vehicle's wheels

The vehicle's fan intake

2 / 30

Normal air brake system pressure range is aroundâ€¦?

138 to 173 kPa (20 to 25 psi)

380 to 420 kPa (55 to 60 psi)

1035 to 1135 kPa (150 to 164 psi)

690 to 828 kPa (100 to 120 psi)

3 / 30

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

The wet tank

The compressor

The brake chamber

The primary tank

4 / 30

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

Regular mechanics

Certified technicians

Vehicle owners

Drivers licensed to operate air brake vehicles

5 / 30

The spring brake subsystem is designed for which of these?

All of these

Heavy skidding

Parking and emergencies

Normal stopping

6 / 30

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

So that you can clean them

So that you can check their pressure

Because it can be dangerous

It isn't particularly important

7 / 30

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

617 kPa (89 psi)

436 kPa (63 psi)

334 kPa (48 psi)

552 kPa (80 psi)

8 / 30

The supply tank for an air brake system does what?

Collects only moisture from the air

Adds moisture to the air

Collects moisture and oil from the air

Collects only oil from the air

9 / 30

Where will you find air brake chambers?

On the rear wheels

On each wheel

On the front wheels

To the compressor

10 / 30

Spring brakes are applied when...?

Air pressure reduces in the compressor

Air pressure leaves the brake chamber

Air pressure builds up in the wet tank

Air pressure builds up in the brake chamber

11 / 30

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

Next to the compressor

Attached to the brake discs

On the vehicle dashboard

Underneath the vehicle hood

12 / 30

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

Under or around the frame of the vehicle

On top of the engine

Above the rear license plate

On top of the vehicle cab

13 / 30

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

It can freeze in cold temperatures

All of these

It can reduce the volume of air

It can cause corrosion

14 / 30

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

414 kPa (60 psi)

514 kPa (74 psi)

614 kPa (89 psi)

314 kPa (45 psi)

15 / 30

Why do air brake systems have dual-service tanks?

For power

For economy

For safety

For efficiency

16 / 30

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

The second air tank

The supply tank

The third air tank

The last air tank

17 / 30

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

To slow the system down

To prevent freezing

To increase pressure

To prevent overheating

18 / 30

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

Regulates the air pressure

Regulates the speed of your vehicle

Regulates the revolutions of the engine

Regulates the amount of air released to the brakes

19 / 30

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

Between the compressor and the supply tank

Between the supply tank and the second tank

Between the second tank and the third tank

In any of these locations

20 / 30

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

All of these

Normal braking

Parking

Emergency braking

21 / 30

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

Have it checked at the next garage

Stop immediately

Alert the mechanics at the end of your journey

Proceed at a low speed

22 / 30

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

More efficient braking

More wheel lock

Less efficient braking

A split second delay

23 / 30

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

1035 kPa (150 psi)

935 kPa (135 psi)

1235 kPa (179 psi)

1135 kPa (164 psi)

24 / 30

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

A motorcycle

A school bus

A large sedan

A pickup truck

25 / 30

A braking system works by converting mechanical energy into what?

Gas

Water

Heat

Air

26 / 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 front wheels

Increase the pressure at the rear wheels

Reduce the pressure at the rear wheels

27 / 30

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

320 kPa (46 psi)

360 kPa (52 psi)

380 kPa (55 psi)

420 kPa (60 psi)

28 / 30

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

Lining

Rotor

Shoe

Drum

29 / 30

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

It opens wider

It remains the same

It starts to narrow

Any of these depending how hard you press

30 / 30

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

Hourly

Daily

Weekly

Monthly

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.