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

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

Keep the engine running between 600 and 900 rpm

Park on level ground

2 / 30

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

The activated position

The release position

The resting position

The forward position

3 / 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

4 / 30

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

Winding them off

Turning them down

Turning them up

Letting them cool

5 / 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

6 / 30

The spring parking brake system can also act as what?

Air-over hydraulic brakes

An emergency brake

Hydraulic brakes

Service brakes for the trailers

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

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

The two-way valve

The relay valve

The quick release valve

The one-way valve

9 / 30

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

Reduce the braking effort to the front wheels

None of these

To improve vehicle mileage

To reduce the speed of the vehicle without braking

10 / 30

What is another word for when the spring compresses?

Cages

Downsizes

Pushes

Shrinks

11 / 30

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

None of these

Spring pressure

Air pressure

Hydraulics

12 / 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 through the centre of the chamber body, which is turned to compress the spring

With a bolt that runs beside the chamber body

13 / 30

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

Nothing

A fan

A dust cap

A filter

14 / 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

The brakes no longer grab

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

15 / 30

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

Missing

Wrong size

Manually caged

Expanded

16 / 30

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

Releasing the foot valve

Closing the control valse

None of these

Opening the control valve

17 / 30

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

Finding out which spring has to be caged

Releasing the spring

Releasing the air pressure

Compressing the spring with a caging bolt

18 / 30

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

A warning light activates

Nothing

The pressure gauge activates

The spring parking brakes will be activated

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?

None of these

Stop the vehicle quickly

Fall off

Crack or warp

20 / 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 by the spring brakes when the vehicle is still in motion

The force applied when the air pressure is below 35 psi

21 / 30

Instruction on how to cage is usually found where?

From a licensed mechanic

From the carrier

On the body of the parking brake chamber

With the vehicle's manual

22 / 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 adjustment of the service brakes

The weight and speed of the vehicle

The type of spring brakes

23 / 30

The effectiveness of the spring parking brake depends on what?

The service brake adjustment

The size of the spring

The pressure the spring provides

The type of brakes

24 / 30

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

Normal

Smooth

Wet

Rough

25 / 30

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

Less than 60%

Less than 50%

Less than 45%

Less than 20%

26 / 30

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

Releasing the two-way valve

Turning off the compressor

Draining the wet tank

Blocking the wheels

27 / 30

How many uses does the relay valve have?

One

Four

Three

Two

28 / 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

29 / 30

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

It does not expand

It retracts

Nothing happens

It does expand

30 / 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

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Air Brake Practice Test 04

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