Manitoba Air Brake Test 04

By taking the practice test, you will become familiar with the air brake system, pre-trip inspections, brake adjustment, and air brake system malfunctions, amongst other crucial aspects. The free Manitoba Air Brake practice test is easily accessible online and can be taken multiple times until you feel confident in all areas tested. Don’t hesitate to take this valuable resource to ensure you pass your air brake test confidently and quickly.

1 / 30

Is the brake system of a converter dolly that attaches one trailer to another is essentially the same as a trailer system?

Larger brakes

Less brakes

Yes

2 / 30

What's another name of trailer couplers?

None of the above

Hookhands

Gladhands

Dummyhands

3 / 30

The air pressure may drop due to one of the following:

The pads fail

The compressor stops working

The air dissipates while parked

The trailer supply line ruptures or becomes disconnected for some reason

4 / 30

How can you avoid the possibility of cross connecting the lines?

Ask for help

Label the lines

Match the colours

Keep the lines separated

5 / 30

What type of chamber is used on buses and motor coaches instead of using a large spring in the brake chamber?

A DD8 Safety Actuator

A DD3 Safety Actuator

A DD7 Safety Actuator

A DD5 Safety Actuator

6 / 30

Why are the components within the wheel difficult to see on the S-cam brakes?

They are housed within the plate

They aren't

They are hidden above the wheel housing

A dust shield or backing plate is used to protect the components

7 / 30

The trailer supply valve closes automatically when air pressure in the trailer supply line drops to how much psi?

Between 30 and 35 psi

Between 20 and 45 psi

Between 40 and 55 psi

Between 25 and 30 psi

8 / 30

Which statement is false? The types of foundation brake systems are...

S-cam brakes

Wedge brakes

T-brakes

Disc brakes

9 / 30

What's the purpose of the service line?

It carries pressure for the service brakes

It carries pressure to the compressor

It connects the air compressor to the governor

None of the above

10 / 30

What reduces the ability of service brakes to stop a vehicle and reduces the ability of spring brakes to stop or hold a vehicle?

Poor brake adjustment

Low air pressure

None of the above

Soft tires

11 / 30

Trailer couplers or 'gladhands' are used to do what?

To connect one air hose with another

To connect the air brake system of the towing vehicle to the air brake system of the trailer

To connect the service lines to the service tanks

To operate lighting systems

12 / 30

Should trailer hand valves ever be used for parking or emergency stops?

For older vehicles only

Only for tandem trailers

Yes

13 / 30

Why are the brake-assembly components at the wheels of a vehicle generally called the foundation components?

They are grounded like a foundation

They form the basis on which the rest of the system is built

No reason

They are based around one principle

14 / 30

To prevent air loss from these lines when they are not in use, what are the service and supply lines equipped with?

Open couplers

Dual couplers

Manual shut-off valves

Closed couplers

15 / 30

In an emergency when the trailer service brakes fail, the trailer spring brakes can be applied how?

By applying the cable brakes

By using the trailer supply valve

By applying the emergency valve

By releasing the service brakes

16 / 30

Most towing vehicles have receptacles called 'dead end' or 'dummy' couplers. What do they do?

They keep them from being used incorrectly

They provide a place for them to sit

They protect them from dirt and water when not in use

They keep them from falling to the ground

17 / 30

Once the trailer supply valve closes, the tractor protection valve on the towing vehicle also closes. What does this do?

This prevents air loss out of the towing vehicle when there is no trailer attached

None of the above

This adds more air pressure to the towing vehicle

This locks the air flow from the supply line

18 / 30

How does the driver operate the trailer supply valve?

The driver pushes in to open and supply air to the trailer

The driver turns it counter clockwise to open and supply air to the trailer

The driver turns it clockwise to open and supply air to the trailer

The driver pulls it out to open and supply air to the trailer

19 / 30

Does the air brake system on a trailer include air tanks and automatic spring brakes?

Only spring brakes

Yes

Only air tanks

20 / 30

Can trailers with spring brake priority be towed without waiting for the service brake air tanks to fill?

Only with modern tractors

On older vehicles only

Yes

21 / 30

Which of the following is not an internal part of the s-cam brakes?

Anchor springs to hold the brake shoes in position at the anchor end

Brake chamber and mounting brackets

Camshaft rollers that rotate with the camshaft while moving the brake shoes inward and outward

A brake spider that serves as the main mounting base for the brake shoes

22 / 30

Which statement is false? When trailer lines are cross connected, what could happen?

The service brakes will not function properly

The spring brakes may not release

The towing vehicle may lose air

The primary tank will gain too much air pressure

23 / 30

Should vehicles that are designed to tow trailers be fitted with additional valves used only for the trailer?

Yes

Only when towing tandem trailers

Just the older vehicles

24 / 30

In most cases, the trailer couplers are colour-coded during manufacturing, so if red is for the supply line, what colour is for the service line?

Red

Blue

Green

Black

25 / 30

What happens when the driver fails to close the trailer supply valve when there is no trailer attached?

The truck gains speed

There's lurching when the driver attempts to stop the vehicle

The truck fails to gain speed effectively

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

26 / 30

Spring brake control valves are designed to respond to air brake system pressure dropping below what psi?

30 psi

60 psi

40 psi

50 psi

27 / 30

What is the most common type of foundation brake used on commercial vehicles with air brake systems?

They are all the same

S-cam brakes

Disc brakes

Wedge brakes

28 / 30

What is the purpose of the supply line?

It holds the air

It brings hydraulic fluid to the air-over hydraulic lines

It carries air to fill the trailer's tanks

It brings air from the compressor to the supply tank

29 / 30

Trailers with service brake priority do what first?

Take more air than spring brakes

Fill the service brake air tank before filling the spring brake air tank

Get serviced by technicians

Nothing

30 / 30

What's another name for the supply line?

Emergency line

Primary line

Secondary line

Safety line

Your score is

Manitoba Air Brake Test 04

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