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

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

The pressure gauge activates

The spring parking brakes will be activated

A warning light activates

Nothing

2 / 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 break

They could get stuck

3 / 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 reduce the speed of the vehicle without braking

To improve vehicle mileage

4 / 30

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

The release position

The activated position

The resting position

The forward position

5 / 30

Instruction on how to cage is usually found where?

On the body of the parking brake chamber

With the vehicle's manual

From a licensed mechanic

From the carrier

6 / 30

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

Smooth

Wet

Rough

Normal

7 / 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?

Stop the vehicle quickly

Fall off

None of these

Crack or warp

8 / 30

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

Turning them up

Turning them down

Letting them cool

Winding them off

9 / 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

10 / 30

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

Hydraulics

Air pressure

Spring pressure

None of these

11 / 30

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

None of these

Opening the control valve

Releasing the foot valve

Closing the control valse

12 / 30

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

None of these

The trailer service brakes

The trailer spring brakes

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

13 / 30

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

The type of spring brakes

The spring force of the spring brakes that have been installed

The weight and speed of the vehicle

The adjustment of the service brakes

14 / 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

15 / 30

What is meant by compounding?

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

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 service brakes when the vehicle is fully stopped

16 / 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

17 / 30

What is another word for when the spring compresses?

Downsizes

Pushes

Cages

Shrinks

18 / 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 bolt that runs beside the chamber body

With a twist of the release valve

19 / 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

20 / 30

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

The brakes no longer grab

There is no longer any smoke coming from the brakes

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

The brake temperature gauge has a level reading

21 / 30

How many uses does the relay valve have?

Two

Four

Three

One

22 / 30

The spring parking brake system can also act as what?

Hydraulic brakes

Service brakes for the trailers

An emergency brake

Air-over hydraulic brakes

23 / 30

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

Park on level ground

Stop the engine and leave the transmission in the lowest gear

Block the wheels

Keep the engine running between 600 and 900 rpm

24 / 30

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

It retracts

Nothing happens

It does not expand

It does expand

25 / 30

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

Manually caged

Wrong size

Missing

Expanded

26 / 30

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

The two-way valve

The one-way valve

The quick release valve

The relay valve

27 / 30

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

A filter

Nothing

A dust cap

A fan

28 / 30

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

Less than 60%

Less than 45%

Less than 20%

Less than 50%

29 / 30

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

Draining the wet tank

Turning off the compressor

Blocking the wheels

Releasing the two-way valve

30 / 30

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

Releasing the air pressure

Releasing the spring

Finding out which spring has to be caged

Compressing the spring with a caging bolt

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Air Brake Practice Test 04

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