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

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

To operate lighting systems

To connect the service lines to the service tanks

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

To connect one air hose with another

2 / 30

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

Disc brakes

S-cam brakes

T-brakes

Wedge brakes

3 / 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

4 / 30

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

Disc brakes

Wedge brakes

They are all the same

S-cam brakes

5 / 30

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

Between 25 and 30 psi

Between 30 and 35 psi

Between 20 and 45 psi

Between 40 and 55 psi

6 / 30

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

Ask for help

Keep the lines separated

Match the colours

Label the lines

7 / 30

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

The truck gains speed

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

8 / 30

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

By applying the cable brakes

By applying the emergency valve

By releasing the service brakes

By using the trailer supply valve

9 / 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

10 / 30

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

For older vehicles only

Only for tandem trailers

Yes

11 / 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

They are based around one principle

No reason

12 / 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

None of the above

Low air pressure

Soft tires

13 / 30

Trailers with service brake priority do what first?

Nothing

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

Get serviced by technicians

Take more air than spring brakes

14 / 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?

Blue

Green

Red

Black

15 / 30

What is the purpose of the supply line?

It holds the air

It brings hydraulic fluid to the air-over hydraulic lines

It brings air from the compressor to the supply tank

It carries air to fill the trailer's tanks

16 / 30

What's another name for the supply line?

Safety line

Secondary line

Primary line

Emergency line

17 / 30

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

The primary tank will gain too much air pressure

The towing vehicle may lose air

The spring brakes may not release

The service brakes will not function properly

18 / 30

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

Manual shut-off valves

Closed couplers

Open couplers

Dual couplers

19 / 30

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

Yes

Only spring brakes

Only air tanks

20 / 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

21 / 30

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

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

They keep them from being used incorrectly

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

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

30 psi

50 psi

60 psi

40 psi

24 / 30

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

On older vehicles only

Only with modern tractors

Yes

25 / 30

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

This locks the air flow from the supply line

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

This adds more air pressure to the towing vehicle

None of the above

26 / 30

What's the purpose of the service line?

It carries pressure for the service brakes

It carries pressure to the compressor

None of the above

It connects the air compressor to the governor

27 / 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

28 / 30

What's another name of trailer couplers?

Dummyhands

Hookhands

Gladhands

None of the above

29 / 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

30 / 30

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

The air dissipates while parked

The pads fail

The compressor stops working

The trailer supply line ruptures or becomes disconnected for some reason

Your score is

Manitoba Air Brake Test 04

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