With our free practice tests, you can improve your chances of passing the Ontario Air Brake test and obtaining your commercial driver’s license, enabling you to advance your career in the trucking industry.


Ontario Air Brake Test 03

1 / 30

Which of these significantly decreases the brake force produced at the wheel?

2 / 30

For safety, the full capacity of the brake system must be available...?

3 / 30

Inspections of air brake systems should begin by checking...?

4 / 30

Which of these parts would you find on a disk air brake system?

5 / 30

Which of these circumstances is not likely to increase the operating temperature of the brakes?

6 / 30

When towing a trailer, you will usually be able to tell if it is employing ABS by...?

7 / 30

In extreme cases, brake fade can lead to...?

8 / 30

Which of these parts would you not find on an 'S' cam air brake system?

9 / 30

When you double your speed, the demand on your brakes to come to a stop will increase by how much?

10 / 30

You will place abnormal demand on your brake system if you...?

11 / 30

What does the 'S' shape on the one end of the camshaft operate in the 'S' cam system?

12 / 30

Which of these parts would you not find on a wedge air brake system?

13 / 30

Brakes that are out of adjustment can be detected by...?

14 / 30

When conducting an inspection of an air brake system, the vehicle should be parked...?

15 / 30

A vehicle should have wheel chocks or blocks securing it in place during inspection if...?

16 / 30

Wedge brake systems are designed to be...?

17 / 30

What does an ABS system do?

18 / 30

How are wedge brake systems different to other drum brake systems?

19 / 30

Excessive brake temperature can be avoided in vehicles which are fitted with...?

20 / 30

The best way to reduce harsh brake use is to...?

21 / 30

The Ontario Highway Traffic Act requires that vehicles with air brakes must be checked at least once...?

22 / 30

When making an inspection of an air brake system, drivers should wear...?

23 / 30

Which of these is essential to ensure that full braking force is available?

24 / 30

If a vehicle fails to comply with the specific requirements for the safe operation of commercial motor vehicles as set out in the Ontario Highway Traffic Act, the driver, operator and/or owner of the vehicle must...?

25 / 30

Which of these is not a part of a disc air brake system?

26 / 30

If a vehicle is found to be noncompliant with the safe operation requirements in the Ontario Highway Traffic Act, which of these sanctions may be applied?

27 / 30

Brake fade is caused by...?

28 / 30

Which of these will not be a factor on how your vehicle's brakes work?

29 / 30

When making any inspection, drivers should be on guard for...?

30 / 30

In the 'S' cam brake system, what does a brake spider hold?

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AZ Practice Test

Our free AZ 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.

Take a Practice Test – After studying for a bit and feeling comfortable with the material, take an AZ practice test. This will help you identify any issues early on and let you know what areas need work. Do not get upset if you do poorly on the practice test. Learn from your mistakes, and fix the areas you have trouble with.