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

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

Releasing the foot valve

None of these

Closing the control valse

Opening the control valve

2 / 30

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

Winding them off

Turning them up

Turning them down

Letting them cool

3 / 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

Keep the engine running between 600 and 900 rpm

Block the wheels

4 / 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 brakes no longer grab

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

The brake temperature gauge has a level reading

5 / 30

How are the brakes caged?

With a valve that releases the spring

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

With a twist of the release valve

With a bolt that runs beside the chamber body

6 / 30

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

Less than 60%

Less than 20%

Less than 50%

Less than 45%

7 / 30

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

They could break

There is no danger

They could get stuck

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

8 / 30

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

The driver

A qualified mechanic or technician

All of the above

The vehicle owner

9 / 30

How many uses does the relay valve have?

Four

Two

One

Three

10 / 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

11 / 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

12 / 30

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

The adjustment of the service brakes

The weight and speed of the vehicle

The type of spring brakes

The spring force of the spring brakes that have been installed

13 / 30

The spring parking brake system can also act as what?

Hydraulic brakes

Air-over hydraulic brakes

An emergency brake

Service brakes for the trailers

14 / 30

What is another word for when the spring compresses?

Downsizes

Cages

Shrinks

Pushes

15 / 30

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

Releasing the air pressure

Finding out which spring has to be caged

Compressing the spring with a caging bolt

Releasing the spring

16 / 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

17 / 30

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

Wrong size

Expanded

Manually caged

Missing

18 / 30

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

The trailer spring brakes

None of these

The trailer service brakes

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

19 / 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 and the service brake

The force applied when the air pressure is below 35 psi

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

20 / 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 35 to 40 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 0 to 10 psi, depending on how it has been pre-set

21 / 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

None of these

To reduce the speed of the vehicle without braking

Reduce the braking effort to the front wheels

22 / 30

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

The quick release valve

The two-way valve

The one-way valve

The relay valve

23 / 30

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

Wet

Rough

Smooth

Normal

24 / 30

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

The release position

The resting position

The forward position

The activated position

25 / 30

Instruction on how to cage is usually found where?

From the carrier

From a licensed mechanic

On the body of the parking brake chamber

With the vehicle's manual

26 / 30

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

It retracts

It does not expand

It does expand

Nothing happens

27 / 30

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

Hydraulics

Air pressure

None of these

Spring pressure

28 / 30

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

Turning off the compressor

Releasing the two-way valve

Draining the wet tank

Blocking the wheels

29 / 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

30 / 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

Fall off

None of these

Stop the vehicle quickly

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Air Brake Practice Test 04

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