ONTARIO AIR BRAKE PRACTICE TEST 04

Our practice tests cover all the material that will be on the actual exam, including air brake system theory, air brake system components, and air brake inspection and maintenance procedures. By using our practice tests, you can identify any areas of weakness that you may have, and focus your studying efforts on those topics to reinforce your understanding.

Ontario Air Brake Test 04

1 / 30

When testing the spring brakes on a towing vehicle and trailer, it is preferable to perform the test on...?

The trailer

The towing vehicle

Either vehicle

Both vehicles

2 / 30

When checking a vehicle's brake drums, you should be looking out for...?

All of these things

Cracks

Moisture

Discoloration

3 / 30

The application of the automatic trailer spring brakes can be confirmed by...?

Gently applying engine power

Physically pushing the trailer

Visual inspection

Accelerating the vehicle hard

4 / 30

Air compressors should always be inspected with...?

The engine idling in neutral

The engine off

The engine running in high gear

The engine running in first gear

5 / 30

The minimum pressure for compressor cut-in is...?

552 kPa (80 psi)

502 kPa (72 psi)

452 kPa (65 psi)

602 kPa (87 psi)

6 / 30

A tractor protection valve should be tested by disconnecting the trailer service line and then...?

Shifting into first gear

Driving 100 yards

Starting the engine

Applying the brake pedal

7 / 30

If a vehicle has a foundation brake defect, the Ontario Highway Traffic Act specifies that it may not...?

Be operated on the road except to be taken to be fixed

Be operated in urban areas

Be operated on any high speed road

Be operated on any road or highway

8 / 30

When the air pressure has been reduced to below 552 kPa, it should then be able to rise from 587 kPa to 690 kPa within...?

Two minutes

Four minutes

One minute

Three minutes

9 / 30

The amount of air loss from a system should be measured with the brake fully applied for how long?

Two minutes

One minute

30 seconds

Three minutes

10 / 30

The discovery of a small quantity of oil is only no cause for concern if it comes from...?

The supply tank

The second tank

The final tank

The third tank

11 / 30

The maximum allowable air loss for a tractor and trailer when the brakes are applied is...?

28 kPa (4 psi) per minute

26 kPa (3.7 psi) per minute

32 kPa (4.5 psi) per minute

34 kPa (6 psi) per minute

12 / 30

Spring brakes should be tested by applying the brakes and...?

Sharply applying engine power in a low gear

Gently applying engine power in a high gear

Sharply applying engine power in a high gear

Gently applying engine power in a low gear

13 / 30

Actual cut-out pressure must never be higher than...?

932 kPa (135 psi)

972 kPa (140 psi)

902 kPa (130 psi)

1000 kPa (145 psi)

14 / 30

When checking air brake chambers, you should be looking out for...?

All of these things

Mismatched slack adjuster lengths

Cracks

Non-manufactured holes

15 / 30

The amount of moisture discharged from tanks other than the supply tank should be...?

The same as that from the supply tank

Less than that from the supply tank

Any of these

More than that from the supply tank

16 / 30

Air brake chamber leaks must be inspected for with...?

Both sets of brakes released

Service brakes released and spring brakes applied

Both sets of brakes applied

Spring brakes released and service brakes applied

17 / 30

A tractor hauling two or more trailers must not lose air pressure with the brakes fully applied at a rate of more than...?

37 kPa (5.3 psi) per minute

44 kPa (6.3 psi) per minute

34 kPa (4.9 psi) per minute

41 kPa (5.9 psi) per minute

18 / 30

The low air pressure warning device is defective if it fails to activate at a minimum level of...?

380 kPa (55 psi)

280 kPa (40 psi)

180 kPa (26 psi)

480 kPa (69 psi)

19 / 30

You should make sure that air tanks are securely attached to the vehicle by...?

Pulling on them

Looking at them

Tapping them

Any of these

20 / 30

An air pressure buildup time test should be made with the engine idling between...?

500 - 700 RPM

400 - 600 RPM

600 - 900 RPM

700 - 1000 RPM

21 / 30

The drive belt of an air compressor should give slightly under...?

Light hand pressure

A heavy blow

Finger pressure

Firm hand pressure

22 / 30

When applying a test to the spring brakes, the test is only passed if...?

The vehicle does not travel forward more than 2 m

The wheels do not turn more than two revolutions

The wheels do not turn the more than three quarters of a revolution

The vehicle only rocks slightly

23 / 30

Brake lining is the friction material that is fastened to...?

The brake shoe

The wheel rim

The brake drum

The tire

24 / 30

Brake lining can be contaminated by...?

Grease

Grease and Oil

Oil

Water

25 / 30

You must never make an inspection of your brakes unless...?

Wheel chocks or blocks are in place

The spring brakes are applied

All of these apply

The vehicle is on level ground

26 / 30

The recommended way to test a trailer's automatic spring brakes is to...?

Disconnect the trailer air supply line

Any of these

Pull out the trailer supply valve

Pump the brake pedal

27 / 30

The outer cover of an air line has been damaged, but there is no leak to the inner tube. What action should you take?

None

Make a note to monitor it

Have the line replaced

Wrap the damaged area with tape

28 / 30

A straight truck, tractor or bus must not lose air pressure with the brakes fully applied at a rate of more than...?

21 kPa (3 psi) per minute

25 kPa (3.6 psi) per minute

34 kPa (5 psi) per minute

37 kPa (5.3 psi) per minute

29 / 30

You should begin a test of the low air pressure warning device with the pressure above...?

721 kPa (104 psi)

421 kPa (61 psi)

521 kPa (75 psi)

621 kPa (90 psi)

30 / 30

If air brake chambers on different sides of an axle are different sizes, this may cause...?

Tire wear

Skidding

Reduced braking force

Braking imbalances

Your score is

Ontario Air Brake Test

Our free Ontario air brake 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.

Eat and Sleep Well – Before the Ontario air brake test, ensure you eat and sleep well. A drop in blood sugar while taking the test can cause issues remembering what you have studied. You will also want to get a good night’s rest before test day. Being tired will significantly reduce alertness and hinder your ability to recall important facts when taking the test.