Air Brake Practice Test 04

The free Air Brake Practice Test provides detailed explanations of the correct answers, allowing you to learn from your mistakes and hone your knowledge in areas where you need extra help. By taking advantage of this valuable tool, you’ll be well-equipped to pass the official air brake test and advance your driving career.

1 / 30

Where does the air in the control line 'dead end' to?

The relay valve

The two-way valve

The one-way valve

The quick release valve

2 / 30

Spring parking brake chambers should never be disassembled without first doing what?

Releasing the spring

Releasing the air pressure

Compressing the spring with a caging bolt

Finding out which spring has to be caged

3 / 30

Some systems may have an additional valve controlled by a blue button that applies what?

Only the tractor spring parking brakes and not the trailer spring parking brakes

The trailer service brakes

The trailer spring brakes

None of these

4 / 30

Anytime the reservoir pressure drops to approximately 35 psi, what happens?

A warning light activates

The spring parking brakes will be activated

Nothing

The pressure gauge activates

5 / 30

Disassembly of a spring brake chamber should be done by...

The vehicle owner

All of the above

A qualified mechanic or technician

The driver

6 / 30

The spring parking brake system can also act as what?

Service brakes for the trailers

Air-over hydraulic brakes

An emergency brake

Hydraulic brakes

7 / 30

What can be accomplished by installing a control valve in the cab and a front brake limiting valve on the front axle?

None of these

To reduce the speed of the vehicle without braking

Reduce the braking effort to the front wheels

To improve vehicle mileage

8 / 30

What should the brake chamber be fitted with to ensure debris will not enter the chamber?

Nothing

A filter

A dust cap

A fan

9 / 30

The control valve is set in what position for dry road surfaces?

Wet

Normal

Rough

Smooth

10 / 30

Parking brakes should be in what position before making a service brake application?

The resting position

The release position

The activated position

The forward position

11 / 30

The effectiveness of the spring parking brake depends on what?

The service brake adjustment

The pressure the spring provides

The type of brakes

The size of the spring

12 / 30

How are the brakes caged?

With a bolt that runs through the centre of the chamber body, which is turned to compress the spring

With a valve that releases the spring

With a twist of the release valve

With a bolt that runs beside the chamber body

13 / 30

During normal service brake operation, wat happens to the parking brake spring?

It retracts

It does not expand

It does expand

Nothing happens

14 / 30

. In the spring parking brake system, the brakes are applied by spring pressure and retracted by what?

None of these

Air pressure

Spring pressure

Hydraulics

15 / 30

What is the danger of disassembling a spring parking brake unit?

They could get stuck

They could break

There is no danger

Springs are under extreme pressure and could cause serious personal injury if disassembly is attempted

16 / 30

Some spring parking brakes can be released mechanically by doing what?

Winding them off

Turning them up

Letting them cool

Turning them down

17 / 30

With an automatic limiting valve, brake applications between 40 psi and 60 psi are reduced to...

Less than 20%

Less than 45%

Less than 50%

Less than 60%

18 / 30

On the pre-trip air brake inspection, you must ensure that the parking brake spring is not...

Expanded

Wrong size

Missing

Manually caged

19 / 30

Is the installation of spring parking brakes and their piping arrangements done the same in all vehicle air brake systems?

All but fire trucks

Yes

All but tandem trailers

20 / 30

when the brake drum has expanded because of extreme heating, when the brake drum starts to cool and contract, the pressure exerted by the spring parking brake may cause the brake drum to do what?

Stop the vehicle quickly

None of these

Fall off

Crack or warp

21 / 30

What is another word for when the spring compresses?

Shrinks

Downsizes

Pushes

Cages

22 / 30

Which statement is false? How quickly the spring brakes will stop the vehicle depends on such factors as...

The spring force of the spring brakes that have been installed

The weight and speed of the vehicle

The type of spring brakes

The adjustment of the service brakes

23 / 30

After overheating the brake drums, when should you set the spring parking brake?

After you have verified the brake drum is cool to the touch

The brake temperature gauge has a level reading

There is no longer any smoke coming from the brakes

The brakes no longer grab

24 / 30

Which statement is false? When parking a vehicle with over heated brakes...

Park on level ground

Keep the engine running between 600 and 900 rpm

Block the wheels

Stop the engine and leave the transmission in the lowest gear

25 / 30

What is meant by compounding?

The force applied by the service brakes when the vehicle is fully stopped

The force applied when the air pressure is below 35 psi

The force applied by the spring brakes and the service brake

The force applied by the spring brakes when the vehicle is still in motion

26 / 30

What is an automatic limiting valve?

It will hold off brake application to the front wheels from 15 to 20 psi, depending on how it has been pre-set

It will hold off brake application to the front wheels from 25 to 30 psi, depending on how it has been pre-set

It will hold off brake application to the front wheels from 35 to 40 psi, depending on how it has been pre-set

It will hold off brake application to the front wheels from 0 to 10 psi, depending on how it has been pre-set

27 / 30

What happens to allow reservoir air pressure to flow to the spring parking brake chambers?

Releasing the foot valve

None of these

Opening the control valve

Closing the control valse

28 / 30

Instruction on how to cage is usually found where?

With the vehicle's manual

From a licensed mechanic

On the body of the parking brake chamber

From the carrier

29 / 30

How many uses does the relay valve have?

Three

Four

Two

One

30 / 30

What should always be done when caging the parking brake spring?

Turning off the compressor

Draining the wet tank

Releasing the two-way valve

Blocking the wheels

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Air Brake Practice Test 04

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