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 spring parking brakes can be released mechanically by doing what?

Turning them down

Letting them cool

Winding them off

Turning them up

2 / 30

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

Stop the engine and leave the transmission in the lowest gear

Block the wheels

Park on level ground

Keep the engine running between 600 and 900 rpm

3 / 30

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

Closing the control valse

Releasing the foot valve

None of these

Opening the control valve

4 / 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

5 / 30

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

Finding out which spring has to be caged

Releasing the air pressure

Releasing the spring

Compressing the spring with a caging bolt

6 / 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

None of these

The trailer service brakes

The trailer spring brakes

7 / 30

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

The vehicle owner

All of the above

The driver

A qualified mechanic or technician

8 / 30

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

Spring pressure

None of these

Hydraulics

Air pressure

9 / 30

What is meant by compounding?

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 when the air pressure is below 35 psi

The force applied by the spring brakes and the service brake

10 / 30

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

Less than 45%

Less than 20%

Less than 50%

Less than 60%

11 / 30

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

All but tandem trailers

All but fire trucks

Yes

12 / 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

13 / 30

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

Wrong size

Missing

Expanded

Manually caged

14 / 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 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 15 to 20 psi, depending on how it has been pre-set

15 / 30

The spring parking brake system can also act as what?

Air-over hydraulic brakes

An emergency brake

Service brakes for the trailers

Hydraulic brakes

16 / 30

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

It retracts

It does not expand

Nothing happens

It does expand

17 / 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

18 / 30

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

The spring parking brakes will be activated

The pressure gauge activates

A warning light activates

Nothing

19 / 30

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

To improve vehicle mileage

Reduce the braking effort to the front wheels

To reduce the speed of the vehicle without braking

None of these

20 / 30

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

A filter

A fan

A dust cap

Nothing

21 / 30

Instruction on how to cage is usually found where?

On the body of the parking brake chamber

From the carrier

With the vehicle's manual

From a licensed mechanic

22 / 30

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

Rough

Wet

Smooth

Normal

23 / 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

24 / 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

25 / 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

26 / 30

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

The one-way valve

The quick release valve

The relay valve

The two-way valve

27 / 30

How many uses does the relay valve have?

Three

Two

One

Four

28 / 30

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

They could get stuck

There is no danger

They could break

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

29 / 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?

None of these

Fall off

Crack or warp

Stop the vehicle quickly

30 / 30

What is another word for when the spring compresses?

Cages

Shrinks

Pushes

Downsizes

Your score is

By WordPress Quiz plugin

Air Brake Practice Test 04

About

Practice Tests

Getting a License

Get In Touch