Chapter 9b: Inspecting Air Brake Components

A free Ontario air brake practice test focusing on the chapter “Inspecting Air Brake Components” is an invaluable resource for new drivers and commercial vehicle operators.

Ontario Air Brake Test - Chapter 9b: Inspecting Air Brake Components

1 / 25

When inspecting the air compressor, the driver must check for which of the following?

A loose, frayed or cut drive belt and insecure mounting bracket or fasteners

The compressor paint colour

The brand of the compressor oil

The size of the compressor label

2 / 25

What types of damage or deterioration may occur to brake hoses and tubes?

Faded paint on the vehicle body

Dirty interior surfaces

Wear, cuts, abrasion and heat damage

Rust on the wheel rims only

3 / 25

How are air leaks from brake hoses and tubes usually detected?

By dashboard warning lights only

They are usually detectable audibly

By checking fuel consumption

By tire temperature

4 / 25

Damage to the outer layer of an air line is a concern because:

It improves air flow

It increases tire life

It reduces fuel consumption

It can lead to holes in the inner layers and cause an air leak

5 / 25

The Ontario Highway Traffic Act prohibits operating a vehicle on the road or highway with which of the following brake conditions?

Properly adjusted brakes

New brake linings

A brake drum or rotor defect

A clean brake drum

6 / 25

What is required regarding fittings used in air brake systems?

Any plumbing fittings may be used

Garden hose connectors may be used

Tape alone may be used to join lines

Fittings must be specifically designed and approved for air brake use

7 / 25

Unusual movement of an air tank may indicate:

Correct air pressure

Proper installation

An insecure air tank or mounting bracket

A clean air system

8 / 25

Which air tank condition is considered a defect?

Dry tank exterior

Insecurely mounted air tank

Clearly labelled tank

Painted tank surface

9 / 25

The Ontario Highway Traffic Act prohibits the operation of a vehicle on the road or highway with what kind of air line condition?

Properly secured air lines

Newly installed air lines

Approved fittings

Any air line defect

10 / 25

When inspecting air brake hoses and tubes that make up the air lines, the driver must check for:

Leaks, damage or wear, and improper fittings

Colour coordination with the vehicle

Length of the hose only

Brand name of the hose

11 / 25

What are brake hoses and tubes designed to do in an air brake system?

Provide air-tight seal and strength through layered construction

Deliver fuel to the engine

Carry engine coolant

Support the vehicle frame

12 / 25

Which of the following is a defect related to the air compressor drive?

Loose air compressor drive belt pulley

Proper pulley alignment

Clean pulley surface

Correct pulley size

13 / 25

How should a driver check the security of air tanks?

By listening to the radio

By checking tire pressure

By reading the vehicle manual only

By looking at them and attempting to move them

14 / 25

What mounting condition on an air compressor is considered defective?

Properly torqued bolts

Painted mounting bracket

Insecure air compressor mounting, bracket or fasteners

New fasteners

15 / 25

When inspecting air tanks, the driver must check for:

Tank manufacturer logo

Number of tanks only

Insecure mounting

Tank colour

16 / 25

What may obstruct your view of brake drums and rotors during an inspection?

Wheels, dust shields and other vehicle parts

The exhaust pipe

The steering wheel

The fuel tank

17 / 25

Which belt condition is considered a defect on an air compressor?

Correctly aligned belt

Clean and dry belt

Loose, cut or frayed belt

Properly tensioned belt

18 / 25

When is an air line considered defective?

When it is properly secured

When it is clean and dry

When it is correctly routed

When damage extends into the reinforcing or inner layer

19 / 25

When inspecting brake drums and rotors, what must the driver look for?

Cracked or broken brake drums or rotors

Excessive tire tread wear

Low engine oil level

Dirty windshield

20 / 25

If a compressor is belt-driven, what should be inspected?

The windshield wipers

The colour of the belt

The radio fuse

The condition and tension of drive pulleys and belt

21 / 25

Which of the following is a defect when inspecting a vehicle’s air lines?

An audible air leak

Properly routed lines

Secure line supports

Clean hoses

22 / 25

When must air compressors be inspected?

Only when the engine is idling

With the engine stopped

With the engine at full throttle

Only when driving

23 / 25

What must be checked when inspecting air tanks?

That air tanks are securely attached to the vehicle

The colour of the tank

The radio antenna mount

The size of the fuel filler neck

24 / 25

What indicates that an air compressor drive belt is too loose?

Excessive belt movement when firm hand pressure is applied

No movement at all under pressure

A shiny appearance

A new belt label

25 / 25

A noticeable change in brake behaviour may indicate:

A loose mirror

Low power steering fluid

A burned-out headlight

Defective, cracked or broken drums or rotors

Your score is

This practice test covers key areas, including inspecting air lines for leaks, checking brake chambers and slack adjusters, and ensuring brake shoes are in good condition. By taking practice tests, candidates can familiarize themselves with key inspection steps and common questions on the official exam. Regular practice builds confidence and reinforces knowledge, helping users identify weaknesses in their understanding. Ultimately, these free tests are essential tools for preparing to operate air brake systems safely.