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

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

Black

Yellow

Blue

Red

2 / 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

3 / 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 service brakes

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

4 / 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

All of the above

Re-instate it

To temporarily disable it

5 / 30

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

45 psi

60 psi

50 psi

35 psi

6 / 30

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

The force line

The supply line

The main line

The complete line

7 / 30

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

A round blue knob

A square blue knob

A square green knob

A round green knob

8 / 30

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

A caging bolt

A spring bolt

The pushrod bolt

A wrench

9 / 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

10 / 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 apply the spring brakes while the service brakes are still applied

It will adjust the pressure in the spring brakes

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

11 / 30

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

The secondary line

Pressure line

The service line

The backup line

12 / 30

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

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

The service brakes fade

The spring brakes automatically apply

All of the above

13 / 30

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

Bushings

Clamps

Gladhands

Glad clamps

14 / 30

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

None of the above

Brackets

A clamp assembly

Slack bolts

15 / 30

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

Air tanks

Brake chambers

Slack adjusters

Valves

16 / 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

17 / 30

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

A latch dolly

A loop dolly

A hook-up dolly

A converter dolly

18 / 30

What is another word used when the springs are compressed?

Compacted

Caged

Pressed

Pushed

19 / 30

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

3 to 5

7 to 10

6 to 8

20 / 30

How can disabled or caged spring brake chambers be recognized?

By the markings on the cylinder

By the indent of the caging bolt

None of the above

By the protrusion of the caging bolt or another similar mechanism

21 / 30

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

Black

Yellow

Blue

Red

22 / 30

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

No they may not

It depends on the size of the spring brakes

It depends on the number of spring brakes being applied

Depending on the vehicle weight

23 / 30

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

Up/down

A push/pull

Left/right

Twist

24 / 30

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

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

When there is a sudden burst of air pressure

25 / 30

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

Manual shut-off valves

Hose stoppers

Clamps

Locks

26 / 30

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

All of the above

The quickness that the air leaves the tanks

The size of the chambers

The condition of the brakes and proper brake adjustment

27 / 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 DDS Safety Actuator

A DDD Safety Actuator

A DD3 Safety Actuator

A DD5 Safety Actuator

28 / 30

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

The spring brakes may not release

The service brakes will not function properly

The towing vehicle may lose air

The pressure gauge malfunctions

29 / 30

A DD3 brake chamber has how many air line connections?

Four

One

Two

Three

30 / 30

The tractor protection valve does what?

All of the above

Prevents air from escaping from the supply tank

Prevents air loss from the towing vehicle

Prevents air from bypassing the foot valve

Your score is

Ontario Air Brake Test 04

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