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

Brake lining can be contaminated by...?

Grease and Oil

Oil

Water

Grease

2 / 30

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

The wheels do not turn more than two revolutions

The vehicle only rocks slightly

The vehicle does not travel forward more than 2 m

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

3 / 30

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

Pulling on them

Any of these

Tapping them

Looking at them

4 / 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

5 / 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 on any high speed road

Be operated on any road or highway

Be operated in urban areas

6 / 30

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

34 kPa (5 psi) per minute

25 kPa (3.6 psi) per minute

21 kPa (3 psi) per minute

37 kPa (5.3 psi) per minute

7 / 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

8 / 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

9 / 30

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

The wheel rim

The tire

The brake shoe

The brake drum

10 / 30

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

Disconnect the trailer air supply line

Any of these

Pump the brake pedal

Pull out the trailer supply valve

11 / 30

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

26 kPa (3.7 psi) per minute

32 kPa (4.5 psi) per minute

28 kPa (4 psi) per minute

34 kPa (6 psi) per minute

12 / 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

Wrap the damaged area with tape

Make a note to monitor it

Have the line replaced

13 / 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)

480 kPa (69 psi)

180 kPa (26 psi)

14 / 30

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

Moisture

Cracks

All of these things

Discoloration

15 / 30

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

602 kPa (87 psi)

552 kPa (80 psi)

452 kPa (65 psi)

502 kPa (72 psi)

16 / 30

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

Cracks

Non-manufactured holes

All of these things

Mismatched slack adjuster lengths

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...?

41 kPa (5.9 psi) per minute

44 kPa (6.3 psi) per minute

37 kPa (5.3 psi) per minute

34 kPa (4.9 psi) per minute

18 / 30

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

Two minutes

One minute

Three minutes

30 seconds

19 / 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

Gently applying engine power in a low gear

Sharply applying engine power in a high gear

20 / 30

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

521 kPa (75 psi)

421 kPa (61 psi)

621 kPa (90 psi)

721 kPa (104 psi)

21 / 30

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

Any of these

The same as that from the supply tank

More than that from the supply tank

Less than that from the supply tank

22 / 30

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

700 - 1000 RPM

400 - 600 RPM

600 - 900 RPM

500 - 700 RPM

23 / 30

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

Driving 100 yards

Starting the engine

Shifting into first gear

Applying the brake pedal

24 / 30

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

Light hand pressure

A heavy blow

Firm hand pressure

Finger pressure

25 / 30

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

Wheel chocks or blocks are in place

The vehicle is on level ground

All of these apply

The spring brakes are applied

26 / 30

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

Service brakes released and spring brakes applied

Both sets of brakes applied

Both sets of brakes released

Spring brakes released and service brakes applied

27 / 30

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

902 kPa (130 psi)

932 kPa (135 psi)

972 kPa (140 psi)

1000 kPa (145 psi)

28 / 30

Air compressors should always be inspected with...?

The engine off

The engine idling in neutral

The engine running in first gear

The engine running in high gear

29 / 30

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

Skidding

Reduced braking force

Braking imbalances

Tire wear

30 / 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...?

Four minutes

Two minutes

Three minutes

One minute

Your score is

Ontario Air Brake Test Questions

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.