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?

Finding out which spring has to be caged

Releasing the air pressure

Releasing the spring

Compressing the spring with a caging bolt

2 / 30

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

Releasing the two-way valve

Blocking the wheels

Draining the wet tank

Turning off the compressor

3 / 30

How many uses does the relay valve have?

Three

Four

One

Two

4 / 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 brakes no longer grab

There is no longer any smoke coming from the brakes

The brake temperature gauge has a level reading

5 / 30

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

The release position

The forward position

The activated position

The resting position

6 / 30

Instruction on how to cage is usually found where?

From a licensed mechanic

On the body of the parking brake chamber

With the vehicle's manual

From the carrier

7 / 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

8 / 30

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

Turning them down

Winding them off

Letting them cool

Turning them up

9 / 30

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

Nothing

A warning light activates

The spring parking brakes will be activated

The pressure gauge activates

10 / 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

11 / 30

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

The trailer service brakes

The trailer spring brakes

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

None of these

12 / 30

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

The driver

A qualified mechanic or technician

The vehicle owner

All of the above

13 / 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

14 / 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 spring force of the spring brakes that have been installed

The adjustment of the service brakes

The type of spring brakes

15 / 30

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

A filter

A fan

Nothing

A dust cap

16 / 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?

Crack or warp

Stop the vehicle quickly

Fall off

None of these

17 / 30

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

Less than 50%

Less than 45%

Less than 20%

Less than 60%

18 / 30

What is an automatic limiting valve?

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 0 to 10 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 35 to 40 psi, depending on how it has been pre-set

19 / 30

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

None of these

Closing the control valse

Releasing the foot valve

Opening the control valve

20 / 30

What is another word for when the spring compresses?

Pushes

Cages

Shrinks

Downsizes

21 / 30

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

It does not expand

It does expand

Nothing happens

It retracts

22 / 30

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

Missing

Expanded

Wrong size

Manually caged

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

Stop the engine and leave the transmission in the lowest gear

Block the wheels

24 / 30

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

The two-way valve

The quick release valve

The one-way valve

The relay valve

25 / 30

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

Spring pressure

Air pressure

None of these

Hydraulics

26 / 30

The spring parking brake system can also act as what?

Service brakes for the trailers

Hydraulic brakes

An emergency brake

Air-over hydraulic brakes

27 / 30

The effectiveness of the spring parking brake depends on what?

The type of brakes

The pressure the spring provides

The service brake adjustment

The size of the spring

28 / 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

Reduce the braking effort to the front wheels

To improve vehicle mileage

To reduce the speed of the vehicle without braking

29 / 30

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

Yes

All but tandem trailers

All but fire trucks

30 / 30

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

Normal

Wet

Rough

Smooth

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Air Brake Practice Test 04

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