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

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

Releasing the spring

Finding out which spring has to be caged

Releasing the air pressure

Compressing the spring with a caging bolt

2 / 30

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

Less than 50%

Less than 20%

Less than 45%

Less than 60%

3 / 30

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

Expanded

Missing

Wrong size

Manually caged

4 / 30

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

Turning them down

Winding them off

Letting them cool

Turning them up

5 / 30

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

The weight and speed of the vehicle

The type of spring brakes

The spring force of the spring brakes that have been installed

The adjustment of the service brakes

6 / 30

The spring parking brake system can also act as what?

Hydraulic brakes

Service brakes for the trailers

Air-over hydraulic brakes

An emergency brake

7 / 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

Yes

All but fire trucks

8 / 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

Stop the vehicle quickly

Fall off

Crack or warp

9 / 30

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

The resting position

The forward position

The activated position

The release position

10 / 30

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

Normal

Rough

Wet

Smooth

11 / 30

Instruction on how to cage is usually found where?

On the body of the parking brake chamber

From a licensed mechanic

With the vehicle's manual

From the carrier

12 / 30

The effectiveness of the spring parking brake depends on what?

The service brake adjustment

The type of brakes

The pressure the spring provides

The size of the spring

13 / 30

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

A qualified mechanic or technician

The driver

All of the above

The vehicle owner

14 / 30

How are the brakes caged?

With a bolt that runs beside the chamber body

With a valve that releases the spring

With a twist of the release valve

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

15 / 30

What is another word for when the spring compresses?

Cages

Pushes

Shrinks

Downsizes

16 / 30

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

There is no longer any smoke coming from the brakes

The brake temperature gauge has a level reading

The brakes no longer grab

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

17 / 30

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

It does not expand

It retracts

It does expand

Nothing happens

18 / 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

None of these

To reduce the speed of the vehicle without braking

19 / 30

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

Spring pressure

Hydraulics

None of these

Air pressure

20 / 30

How many uses does the relay valve have?

Three

Four

Two

One

21 / 30

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

Blocking the wheels

Turning off the compressor

Draining the wet tank

Releasing the two-way valve

22 / 30

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

There is no danger

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

They could get stuck

They could break

23 / 30

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

Keep the engine running between 600 and 900 rpm

Park on level ground

Block the wheels

Stop the engine and leave the transmission in the lowest gear

24 / 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

25 / 30

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

The relay valve

The one-way valve

The quick release valve

The two-way valve

26 / 30

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

A fan

A filter

A dust cap

Nothing

27 / 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

28 / 30

What is meant by compounding?

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

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

29 / 30

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

The trailer service brakes

None of these

The trailer spring brakes

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

30 / 30

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

The pressure gauge activates

Nothing

A warning light activates

The spring parking brakes will be activated

Your score is

Air Brake Practice Test 04

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