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

Star-shaped

Trapezoidal

Square

Circular

2 / 40

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

Re-adjust brakes on vehicles fitted with manual slack adjusters

Repair automatic slack adjusters

Install new brake chambers

Re-design the brake system

3 / 40

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

When the air line is longer than 2 metres

When the chamber is painted a dark colour

When the applied pushrod stroke exceeds the adjustment limit

When the vehicle is over 5 years old

4 / 40

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

Only certified technicians

Anyone trained by the employer informally

The vehicle owner’s supervisor

Any licensed driver

5 / 40

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

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

Use of two different tire brands on one axle

Driving with low windshield washer fluid

Washing vehicles on public roads

6 / 40

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

1,034 kPa (150 psi)

621 kPa (90 psi)

207 kPa (30 psi)

345 kPa (50 psi)

7 / 40

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

The tires are underinflated

The automatic slack adjuster is defective

The vehicle is overloaded

The air compressor is too small

8 / 40

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

The distance from the brake pedal to the floor

The thickness of the brake pad

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

The diameter of the brake drum

9 / 40

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

The brake applies more force

The brake automatically repairs itself

The brake is out of adjustment

The brake cools more quickly

10 / 40

What is the most reliable method for inspecting brake adjustment?

Visually checking air tank size

Measuring wheel rim diameter

Measuring the applied pushrod stroke

Measuring tire tread depth

11 / 40

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

Add measurement 1 and measurement 2

Divide measurement 2 by measurement 1

Multiply measurement 1 by measurement 2

Subtract measurement 1 from measurement 2

12 / 40

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

Engine shut off and service brakes fully applied

Engine off and service brakes released

Engine at high idle and service brakes pumped

Engine idling and service brakes released

13 / 40

What must the brake pushrod stroke comply with in Ontario?

Vehicle manufacturer’s warranty rules

Local zoning bylaws

Ontario Highway Traffic Act and regulations

Federal tax codes

14 / 40

Where can brake stroke indicators be fitted?

Only on the tires

Only inside the cab

To the pushrod or brake linkage with external reference points

Only inside the air tank

15 / 40

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

Deflate the air tanks completely

Remove the brake chamber

Mark the pushrod at the brake chamber or a fixed point

Remove the wheels

16 / 40

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

They may unknowingly damage the brake and cause it to malfunction

They will drain the battery

They may overinflate the tires

They will void the radio warranty

17 / 40

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

It decreases

It increases

It fluctuates randomly

It stays the same

18 / 40

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

To increase top vehicle speed

To avoid the need for regular manual re-adjustment

To reduce brake lining material

To eliminate the need for brake inspections

19 / 40

What is the most common brake chamber size mentioned?

20 / 40

Which of the following is a possible brake chamber size?

21 / 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 screwdriver

A special measuring tool designed for brake chambers

22 / 40

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

The size of the steering wheel

The age of the driver

The colour of the truck cab

The body design and suspension of some vehicles

23 / 40

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

Leave it running at high idle

Increase the idle speed

Put it in neutral only

Shut off the engine

24 / 40

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

200 to 300 kPa (30 to 45 psi)

100 to 200 kPa (15 to 30 psi)

621 to 690 kPa (90 to 100 psi)

700 to 800 kPa (100 to 115 psi)

25 / 40

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

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

Any driver with a full licence

Any garage worker

The vehicle owner, regardless of training

26 / 40

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

Remove dirt, corrosion and paint from the surfaces

Replace the air lines

Deflate all tires

Remove the entire brake chamber

27 / 40

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

They must be released

They must be fully applied

They must be caged

Their position does not matter

28 / 40

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

Only during annual safety inspections

Yes, inspection is still required

Only if the vehicle is over 10 years old

No, inspection is no longer required

29 / 40

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

It never varies

By exactly 5 millimetres

By 19 millimetres or more

By 2 millimetres or less

30 / 40

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

Increase air pressure above 1,000 kPa

Remove the chamber from the vehicle

Deflate the tires

Determine the adjustment limit for that brake chamber

31 / 40

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

No, they are not permitted

Yes, if supervised by another driver

Yes, if the vehicle is empty

Yes, but only once per month

32 / 40

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

Hexagonal ports

Oval ports

Square ports

Triangular ports

33 / 40

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

Shut off the engine

Press and hold the brake pedal

Mark the pushrod

Secure the vehicle with wheel chocks or blocks

34 / 40

Why must brake adjustment be inspected regularly?

To reduce fuel consumption

To meet insurance premium requirements only

To ensure proper brake function and safety

To extend tire life only

35 / 40

What are brake stroke indicators generally designed to do?

Show tire temperature

Measure fuel economy

Become visible when pushrod stroke exceeds the adjustment limit

Control engine speed

36 / 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 guessing based on vehicle colour

By counting the number of axles

37 / 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

Covers or housings that conceal the brake linkage

Painted wheel hubs

38 / 40

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

Correct installation, maintenance, and driver training

Replacing indicators daily

Frequent painting of the indicators

Using them only in winter

39 / 40

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

The number of wheel studs

The thickness of the brake pedal

The colour of the air lines

The size and type of each air brake chamber

40 / 40

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

Press and hold it in the fully applied position

Press it halfway only

Release it completely

Pump it rapidly

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.