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. The practice test consists of multiple-choice questions based on the Ontario official air brake handbook. The handbook contains all the information you need to know about air brake systems, including safety-related aspects and proper maintenance procedures. Taking the practice test will give you a clear idea of your strengths and weaknesses, allowing you to focus on the areas that require further study. It is also recommended that you take the practice test multiple times to reinforce your knowledge and build your confidence. Remember, passing the Ontario air brake test is a critical step towards obtaining a commercial driver’s license, and the practice test is an excellent tool to help you achieve this goal.

1 / 30

The tractor protection valve does what?

Prevents air loss from the towing vehicle

All of the above

Prevents air from escaping from the supply tank

Prevents air from bypassing the foot valve

2 / 30

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

6 to 8

7 to 10

3 to 5

3 / 30

A DD3 brake chamber has how many air line connections?

Two

Three

Four

One

4 / 30

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

Blue

Black

Yellow

Red

5 / 30

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

The service line

The secondary line

The backup line

Pressure line

6 / 30

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

It depends how the vehicle is set up

The truck or tractor

Both

The trailer

7 / 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?

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

Regulate the air pressure of the service brakes

Regulate the air pressure of the trailer brakes

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

8 / 30

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

To temporarily disable it

Reduce enough air pressure to use it again

All of the above

Re-instate it

9 / 30

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

The main line

The complete line

The force line

The supply line

10 / 30

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

Stump couplers

None of the above

Fake couplers

Dead end or dummy couplers

11 / 30

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

A square blue knob

A square green knob

A round blue knob

A round green knob

12 / 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

13 / 30

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

When there is a sudden burst of air pressure

When the service 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

When the spring brakes malfunction

14 / 30

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

Brackets

None of the above

A clamp assembly

Slack bolts

15 / 30

What is another word used when the springs are compressed?

Pressed

Caged

Compacted

Pushed

16 / 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

The service brakes fade

All of the above

17 / 30

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

A push/pull

Left/right

Up/down

Twist

18 / 30

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

The towing vehicle may lose air

The spring brakes may not release

The pressure gauge malfunctions

The service brakes will not function properly

19 / 30

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

Clamps

Gladhands

Bushings

Glad clamps

20 / 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 DDD Safety Actuator

A DD3 Safety Actuator

A DDS Safety Actuator

A DD5 Safety Actuator

21 / 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 adjust the pressure in the spring brakes

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

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

22 / 30

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

Hose stoppers

Clamps

Manual shut-off valves

Locks

23 / 30

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

A converter dolly

A loop dolly

A latch dolly

A hook-up dolly

24 / 30

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

All of the above

A flexible seal that provides a leak-free connection

A spare gladhand

Additional hoses

25 / 30

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

60 psi

50 psi

45 psi

35 psi

26 / 30

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

Yellow

Blue

Red

Black

27 / 30

How can disabled or caged spring brake chambers be recognized?

By the markings on the cylinder

None of the above

By the indent of the caging bolt

By the protrusion of the caging bolt or another similar mechanism

28 / 30

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

All of the above

The size of the chambers

The quickness that the air leaves the tanks

The condition of the brakes and proper brake adjustment

29 / 30

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

It depends on the size of the spring brakes

No they may not

It depends on the number of spring brakes being applied

Depending on the vehicle weight

30 / 30

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

Valves

Brake chambers

Slack adjusters

Air tanks

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Ontario Air Brake Test 04

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