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

What's another name for the supply line?

Emergency line

Safety line

Secondary line

Primary line

2 / 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?

Low air pressure

Soft tires

None of the above

Poor brake adjustment

3 / 30

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

40 psi

30 psi

50 psi

60 psi

4 / 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

This locks the air flow from the supply line

None of the above

This adds more air pressure to the towing vehicle

5 / 30

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

Match the colours

Label the lines

Keep the lines separated

Ask for help

6 / 30

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

T-brakes

Wedge brakes

S-cam brakes

Disc brakes

7 / 30

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

No reason

They are based around one principle

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

They are grounded like a foundation

8 / 30

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

To connect the service lines to the service tanks

To operate lighting systems

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

9 / 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

10 / 30

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

Dual couplers

Open couplers

Closed couplers

Manual shut-off valves

11 / 30

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

Less brakes

Yes

Larger brakes

12 / 30

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

Yes

On older vehicles only

Only with modern tractors

13 / 30

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

Yes

For older vehicles only

Only for tandem trailers

14 / 30

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

The service brakes will not function properly

The primary tank will gain too much air pressure

The towing vehicle may lose air

The spring brakes may not release

15 / 30

Trailers with service brake priority do what first?

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

Get serviced by technicians

Nothing

Take more air than spring brakes

16 / 30

How does the driver operate the trailer supply valve?

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

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

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

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

17 / 30

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

Only spring brakes

Yes

Only air tanks

18 / 30

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

The truck fails to gain speed effectively

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

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

The truck gains speed

19 / 30

What's the purpose of the service line?

None of the above

It connects the air compressor to the governor

It carries pressure for the service brakes

It carries pressure to the compressor

20 / 30

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

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

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

Brake chamber and mounting brackets

21 / 30

What's another name of trailer couplers?

Hookhands

Gladhands

None of the above

Dummyhands

22 / 30

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

They aren't

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

They are housed within the plate

They are hidden above the wheel housing

23 / 30

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

A DD7 Safety Actuator

A DD8 Safety Actuator

A DD3 Safety Actuator

A DD5 Safety Actuator

24 / 30

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

The compressor stops working

The trailer supply line ruptures or becomes disconnected for some reason

The pads fail

The air dissipates while parked

25 / 30

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

S-cam brakes

They are all the same

Disc brakes

Wedge brakes

26 / 30

What is the purpose of the supply line?

It carries air to fill the trailer's tanks

It holds the air

It brings air from the compressor to the supply tank

It brings hydraulic fluid to the air-over hydraulic lines

27 / 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?

Green

Blue

Black

Red

28 / 30

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

Between 40 and 55 psi

Between 25 and 30 psi

Between 30 and 35 psi

Between 20 and 45 psi

29 / 30

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

By releasing the service brakes

By applying the emergency valve

By applying the cable brakes

By using the trailer supply valve

30 / 30

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

They keep them from being used incorrectly

They keep them from falling to the ground

They provide a place for them to sit

They protect them from dirt and water when not in use

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Manitoba Air Brake Test 04

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