Chapter 11: Inspecting Air Brake Adjustment

An Ontario air brake practice test focusing on the chapter “Inspecting Air Brake Adjustment” is essential for those preparing for the air brake endorsement.

Ontario Air Brake Test - Chapter 11: Inspecting Air Brake Adjustment

1 / 40

What kind of tool is needed to measure the diameter of brake chambers directly?

A tire pressure gauge

A standard household tape measure

A special measuring tool designed for brake chambers

A screwdriver

2 / 40

What is the first step in the procedure for measuring applied pushrod stroke?

Secure the vehicle with wheel chocks or blocks

Mark the pushrod

Shut off the engine

Press and hold the brake pedal

3 / 40

What are brake stroke indicators generally designed to do?

Measure fuel economy

Become visible when pushrod stroke exceeds the adjustment limit

Show tire temperature

Control engine speed

4 / 40

What shape is the tag under the clamp bolt on many long-stroke brake chambers?

Trapezoidal

Square

Circular

Star-shaped

5 / 40

Before relying on brake chamber markings, what may be necessary to see them clearly?

Deflate all tires

Remove dirt, corrosion and paint from the surfaces

Remove the entire brake chamber

Replace the air lines

6 / 40

When inspecting brake adjustment at each wheel, what must be the status of the engine and service brakes?

Engine at high idle and service brakes pumped

Engine off and service brakes released

Engine shut off and service brakes fully applied

Engine idling and service brakes released

7 / 40

To obtain the applied pushrod stroke using Method 2, what must be done with the two measurements?

Multiply measurement 1 by measurement 2

Divide measurement 2 by measurement 1

Subtract measurement 1 from measurement 2

Add measurement 1 and measurement 2

8 / 40

Why must brake adjustment be inspected regularly?

To reduce fuel consumption

To ensure proper brake function and safety

To meet insurance premium requirements only

To extend tire life only

9 / 40

What happens when the brake pushrod stroke exceeds the adjustment limit?

The brake cools more quickly

The brake applies more force

The brake is out of adjustment

The brake automatically repairs itself

10 / 40

Before inspecting brake adjustment, what must the air pressure be raised above?

207 kPa (30 psi)

345 kPa (50 psi)

1,034 kPa (150 psi)

621 kPa (90 psi)

11 / 40

What must drivers be able to identify to determine the correct adjustment limit?

The colour of the air lines

The number of wheel studs

The size and type of each air brake chamber

The thickness of the brake pedal

12 / 40

As brakes wear, what happens to the brake pushrod stroke?

It fluctuates randomly

It increases

It stays the same

It decreases

13 / 40

After determining the brake chamber’s size and type, what is the next step?

Determine the adjustment limit for that brake chamber

Remove the chamber from the vehicle

Deflate the tires

Increase air pressure above 1,000 kPa

14 / 40

Compared to standard brake chambers, how much can the specified brake adjustment limit vary for long-stroke chambers?

By exactly 5 millimetres

By 2 millimetres or less

It never varies

By 19 millimetres or more

15 / 40

Where can brake stroke indicators be fitted?

Only on the tires

Only inside the air tank

Only inside the cab

To the pushrod or brake linkage with external reference points

16 / 40

In Method 1 of measurement, what is done before applying the brakes?

Mark the pushrod at the brake chamber or a fixed point

Remove the wheels

Deflate the air tanks completely

Remove the brake chamber

17 / 40

What does the Ontario Highway Traffic Act and regulations prohibit regarding brake adjustment?

Use of two different tire brands on one axle

Washing vehicles on public roads

Driving with low windshield washer fluid

Operation of a vehicle with a brake that is out of adjustment

18 / 40

If periodic re-adjustments are required on automatic slack adjusters, what does this indicate?

The vehicle is overloaded

The tires are underinflated

The air compressor is too small

The automatic slack adjuster is defective

19 / 40

In some brake systems, what can make it impossible to inspect brake adjustment using the described techniques?

Lack of a sun visor

Missing radio antenna

Painted wheel hubs

Covers or housings that conceal the brake linkage

20 / 40

Must brake adjustment still be inspected if a vehicle has automatic slack adjusters?

Only if the vehicle is over 10 years old

No, inspection is no longer required

Yes, inspection is still required

Only during annual safety inspections

21 / 40

Which of the following is a possible brake chamber size?

22 / 40

What is necessary to ensure reliable results when using brake-stroke indicators?

Using them only in winter

Frequent painting of the indicators

Correct installation, maintenance, and driver training

Replacing indicators daily

23 / 40

What does an Ontario air-brake adjustment certificate allow a driver to do?

Install new brake chambers

Re-design the brake system

Re-adjust brakes on vehicles fitted with manual slack adjusters

Repair automatic slack adjusters

24 / 40

What is the main purpose of automatic slack (brake) adjusters?

To avoid the need for regular manual re-adjustment

To eliminate the need for brake inspections

To increase top vehicle speed

To reduce brake lining material

25 / 40

When is a brake identified as defective in this inspection method?

When the air line is longer than 2 metres

When the vehicle is over 5 years old

When the applied pushrod stroke exceeds the adjustment limit

When the chamber is painted a dark colour

26 / 40

Why is it dangerous for someone who is not certified to attempt to adjust automatic slack adjusters?

They may overinflate the tires

They will void the radio warranty

They may unknowingly damage the brake and cause it to malfunction

They will drain the battery

27 / 40

What is the most reliable method for inspecting brake adjustment?

Visually checking air tank size

Measuring the applied pushrod stroke

Measuring tire tread depth

Measuring wheel rim diameter

28 / 40

What may limit safe access to certain brake components during inspection?

The size of the steering wheel

The colour of the truck cab

The body design and suspension of some vehicles

The age of the driver

29 / 40

What should be done with the engine before actually measuring pushrod stroke?

Leave it running at high idle

Put it in neutral only

Increase the idle speed

Shut off the engine

30 / 40

Are drivers with an air-brake adjustment certificate permitted to manually re-adjust automatic slack adjusters?

Yes, if the vehicle is empty

Yes, but only once per month

No, they are not permitted

Yes, if supervised by another driver

31 / 40

Who is permitted to perform re-adjustments or repairs on automatic slack adjusters?

Only certified technicians

Any licensed driver

Anyone trained by the employer informally

The vehicle owner’s supervisor

32 / 40

Long-stroke brake chambers can be identified in part by what feature of the air line ports?

Oval ports

Hexagonal ports

Square ports

Triangular ports

33 / 40

What must the brake pushrod stroke comply with in Ontario?

Ontario Highway Traffic Act and regulations

Vehicle manufacturer’s warranty rules

Local zoning bylaws

Federal tax codes

34 / 40

When actually measuring the applied stroke, what must the driver do with the service brake pedal?

Pump it rapidly

Release it completely

Press and hold it in the fully applied position

Press it halfway only

35 / 40

How is brake chamber size commonly determined in practice?

By information from the employer or vehicle owner’s manual

By measuring tire circumference

By counting the number of axles

By guessing based on vehicle colour

36 / 40

Who may repair and perform brake re-adjustments on manual slack adjusters in Ontario?

Any garage worker

The vehicle owner, regardless of training

Only certified technicians or drivers with a valid air-brake adjustment certificate

Any driver with a full licence

37 / 40

When measuring applied pushrod stroke, what must be done with the spring brakes?

They must be caged

They must be fully applied

Their position does not matter

They must be released

38 / 40

What is the most common brake chamber size mentioned?

39 / 40

In Method 2 of measurement, what is “measurement number 1”?

The distance from the brake pedal to the floor

The distance from a point on the pushrod to a fixed point with brakes released

The thickness of the brake pad

The diameter of the brake drum

40 / 40

During the inspection, within what air pressure range should both primary and secondary tank gauges be set?

100 to 200 kPa (15 to 30 psi)

200 to 300 kPa (30 to 45 psi)

700 to 800 kPa (100 to 115 psi)

621 to 690 kPa (90 to 100 psi)

Your score is

This section tests knowledge of proper brake adjustment procedures, including checking slack adjuster movement and ensuring brake components are within legal limits. Practice questions help drivers understand how to identify and correct improper adjustments, which are critical for safe and effective braking. Regularly using these practice tests enables learners to build confidence, reinforce inspection techniques, and meet Ontario’s safety standards. Mastering brake adjustment inspections is key to passing the official test and ensuring safe vehicle operation.