Ontario Air Brake Test 04

If you are planning to take the Ontario air brake test, it is highly recommended that you first take the Ontario air brake practice test. The practice test is a valuable tool that will significantly increase your chances of passing the actual test.

1 / 30

In most cases, the line that carries air to fill the tanks is what colour?

Black

Red

Blue

Yellow

2 / 30

What happens if you fail to close the trailer supply valve when there is no trailer attached?

The spring brakes automatically apply

It allows a large amount of air to escape from the towing vehicle's air brake system

All of the above

The service brakes fade

3 / 30

Each coupler used to connect a trailer must include...

A flexible seal that provides a leak-free connection

A spare gladhand

Additional hoses

All of the above

4 / 30

The tractor protection valve does what?

Prevents air from escaping from the supply tank

Prevents air from bypassing the foot valve

All of the above

Prevents air loss from the towing vehicle

5 / 30

When a spring brake chamber fails, a technician may use the manual caging to do what?

Reduce enough air pressure to use it again

To temporarily disable it

Re-instate it

All of the above

6 / 30

What is another name referred to the couplers used to connect a trailer?

Bushings

Glad clamps

Gladhands

Clamps

7 / 30

The brake system that attaches one trailer to another is called what?

A loop dolly

A converter dolly

A latch dolly

A hook-up dolly

8 / 30

In most cases, the line that carries pressure for the service brakes is what colour?

Black

Yellow

Red

Blue

9 / 30

Many buses and motor coaches are fitted with parking and emergency brakes that do not use a large spring in the brake chamber. What is this called?

A DD5 Safety Actuator

A DD3 Safety Actuator

A DDD Safety Actuator

A DDS Safety Actuator

10 / 30

A technician can manually compress or 'cage' the spring in a spring brake chamber by using what?

A wrench

A caging bolt

A spring bolt

The pushrod bolt

11 / 30

The effectiveness of a vehicle's spring brakes depends on what?

All of the above

The size of the chambers

The condition of the brakes and proper brake adjustment

The quickness that the air leaves the tanks

12 / 30

When the hand valve and brake pedal are used at the same time, which brakes receive the higher pressure?

The truck or tractor

It depends how the vehicle is set up

The trailer

Both

13 / 30

To prevent air loss from gladhands when they are not in use, what are the lines usually equipped with?

Clamps

Locks

Hose stoppers

Manual shut-off valves

14 / 30

If brakes are out of adjustment, will the spring brakes stop or hold a vehicle?

It depends on the number of spring brakes being applied

It depends on the size of the spring brakes

No they may not

Depending on the vehicle weight

15 / 30

Vehicles that are designed to tow trailers must be fitted with additional...

Air tanks

Valves

Brake chambers

Slack adjusters

16 / 30

Which statement is false? When trailer lines are cross connected, the following can happen...

The service brakes will not function properly

The pressure gauge malfunctions

The spring brakes may not release

The towing vehicle may lose air

17 / 30

A DD3 brake chamber has how many air line connections?

Two

Four

One

Three

18 / 30

One connection carries air to fill the trailer's tanks and is called what?

The supply line

The complete line

The force line

The main line

19 / 30

Most towing vehicles have receptacles that protect them from dirt and water when not in use. What are they called?

Fake couplers

None of the above

Stump couplers

Dead end or dummy couplers

20 / 30

What does a tractor parking-brake control valve do?

It will release the trailer spring brakes while keeping the tractor spring brakes applied

It will release the spring brakes on the tractor while keeping the trailer spring brakes applied

It will apply the spring brakes while the service brakes are still applied

It will adjust the pressure in the spring brakes

21 / 30

What are almost all commercial vehicles use a type of brake chamber that is held together by?

A clamp assembly

Slack bolts

None of the above

Brackets

22 / 30

Releasing the spring brakes requires operating the control valve and then pressing the brake pedal for how many seconds?

3 to 5

6 to 8

7 to 10

23 / 30

How can disabled or caged spring brake chambers be recognized?

None of the above

By the protrusion of the caging bolt or another similar mechanism

By the markings on the cylinder

By the indent of the caging bolt

24 / 30

What causes sudden automatic application of the spring brakes and an uncontrolled vehicle stop?

When the service brakes malfunction

When there is a sudden burst of air pressure

When the spring brakes malfunction

When air brake system pressure dropping below 60 psi by exhausting the remaining air that is holding the spring brakes in the released position

25 / 30

A tractor parking-brake control valve is normally...

A round green knob

A square green knob

A square blue knob

A round blue knob

26 / 30

The other trailer connection carries pressure for the service brakes and is called what?

The backup line

The secondary line

The service line

Pressure line

27 / 30

What is another word used when the springs are compressed?

Pushed

Compacted

Caged

Pressed

28 / 30

A spring brake control valve is normally what type of valve?

Up/down

A push/pull

Twist

Left/right

29 / 30

Often, a hand valve is also fitted on the steering column or the instrument panel of the towing vehicle so the driver can do what?

Regulate the air pressure of the trailer brakes

Apply the tractor's service brakes independent of the trailer's brakes

Apply the trailer service brakes independent of the towing vehicle's brakes

Regulate the air pressure of the service brakes

30 / 30

How much air pressure must be supplied to the spring brake chamber to compress the spring in order to release it?

35 psi

50 psi

60 psi

45 psi

Your score is

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The practice exam includes multiple-choice questions derived from the Ontario Official Air Brake Handbook. This handbook provides all the necessary information regarding air brake systems, including safety considerations and proper maintenance practices. Completing the practice exam will help you identify your strengths and weaknesses, allowing you to focus on areas that require more attention. It’s also advisable to take the practice test several times to solidify your knowledge and boost your confidence. Keep in mind that successfully passing the Ontario air brake practice test is an essential step towards obtaining a commercial driver’s license, and the practice test serves as an excellent resource to help you reach this objective.

Ontario Air Brake Test 04

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