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

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

The trailer service brakes

None of these

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

The trailer spring brakes

2 / 30

The spring parking brake system can also act as what?

Hydraulic brakes

An emergency brake

Air-over hydraulic brakes

Service brakes for the trailers

3 / 30

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

It does not expand

Nothing happens

It retracts

It does expand

4 / 30

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

To reduce the speed of the vehicle without braking

None of these

To improve vehicle mileage

Reduce the braking effort to the front wheels

5 / 30

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

The type of spring brakes

The weight and speed of the vehicle

The spring force of the spring brakes that have been installed

The adjustment of the service brakes

6 / 30

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

The resting position

The forward position

The release position

The activated position

7 / 30

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

Manually caged

Expanded

Missing

Wrong size

8 / 30

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

Air pressure

None of these

Hydraulics

Spring pressure

9 / 30

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

Compressing the spring with a caging bolt

Releasing the spring

Releasing the air pressure

Finding out which spring has to be caged

10 / 30

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

Stop the engine and leave the transmission in the lowest gear

Park on level ground

Block the wheels

Keep the engine running between 600 and 900 rpm

11 / 30

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

Wet

Normal

Rough

Smooth

12 / 30

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

The relay valve

The quick release valve

The two-way valve

The one-way valve

13 / 30

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

The driver

All of the above

A qualified mechanic or technician

The vehicle owner

14 / 30

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

Nothing

The pressure gauge activates

The spring parking brakes will be activated

A warning light activates

15 / 30

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

Turning off the compressor

Blocking the wheels

Releasing the two-way valve

Draining the wet tank

16 / 30

What is meant by compounding?

The force applied when the air pressure is below 35 psi

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

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

The force applied by the spring brakes and the service brake

17 / 30

How many uses does the relay valve have?

Two

Four

Three

One

18 / 30

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

The brake temperature gauge has a level reading

There is no longer any smoke coming from the brakes

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

The brakes no longer grab

19 / 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?

Fall off

Stop the vehicle quickly

None of these

Crack or warp

20 / 30

What is an automatic limiting valve?

It will hold off brake application to the front wheels from 0 to 10 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 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

21 / 30

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

Less than 50%

Less than 60%

Less than 45%

Less than 20%

22 / 30

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

Turning them down

Winding them off

Turning them up

Letting them cool

23 / 30

How are the brakes caged?

With a twist of the release valve

With a valve that releases the spring

With a bolt that runs beside the chamber body

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

24 / 30

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

Closing the control valse

Opening the control valve

Releasing the foot valve

None of these

25 / 30

Instruction on how to cage is usually found where?

From the carrier

With the vehicle's manual

From a licensed mechanic

On the body of the parking brake chamber

26 / 30

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

They could break

There is no danger

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

They could get stuck

27 / 30

What is another word for when the spring compresses?

Shrinks

Pushes

Cages

Downsizes

28 / 30

The effectiveness of the spring parking brake depends on what?

The type of brakes

The service brake adjustment

The size of the spring

The pressure the spring provides

29 / 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

All but tandem trailers

Yes

30 / 30

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

A dust cap

A filter

Nothing

A fan

Your score is

Air Brake Practice Test 04

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