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

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

Turning them up

Turning them down

Letting them cool

Winding them off

2 / 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

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

The brakes no longer grab

3 / 30

The effectiveness of the spring parking brake depends on what?

The service brake adjustment

The pressure the spring provides

The type of brakes

The size of the spring

4 / 30

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

A qualified mechanic or technician

The vehicle owner

All of the above

The driver

5 / 30

What is another word for when the spring compresses?

Pushes

Shrinks

Downsizes

Cages

6 / 30

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

Releasing the spring

Releasing the air pressure

Finding out which spring has to be caged

Compressing the spring with a caging bolt

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

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

Normal

Smooth

Rough

Wet

9 / 30

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

The one-way valve

The relay valve

The two-way valve

The quick release valve

10 / 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

To improve vehicle mileage

Reduce the braking effort to the front wheels

To reduce the speed of the vehicle without braking

11 / 30

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

A fan

A dust cap

A filter

Nothing

12 / 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

13 / 30

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

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

None of these

The trailer service brakes

The trailer spring brakes

14 / 30

How are the brakes caged?

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 valve that releases the spring

With a twist of the release valve

15 / 30

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

Keep the engine running between 600 and 900 rpm

Block the wheels

Park on level ground

Stop the engine and leave the transmission in the lowest gear

16 / 30

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

Nothing happens

It retracts

It does expand

It does not expand

17 / 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

Crack or warp

Stop the vehicle quickly

Fall off

18 / 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

19 / 30

What is meant by compounding?

The force applied when the air pressure is below 35 psi

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

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

20 / 30

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

Spring pressure

Hydraulics

Air pressure

None of these

21 / 30

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

Missing

Expanded

Manually caged

Wrong size

22 / 30

The spring parking brake system can also act as what?

Air-over hydraulic brakes

Service brakes for the trailers

Hydraulic brakes

An emergency brake

23 / 30

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

Turning off the compressor

Draining the wet tank

Blocking the wheels

Releasing the two-way valve

24 / 30

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

Less than 45%

Less than 20%

Less than 50%

Less than 60%

25 / 30

What is an automatic limiting valve?

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

It will hold off brake application to the front wheels from 15 to 20 psi, depending on how it has been pre-set

26 / 30

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

The release position

The resting position

The activated position

The forward position

27 / 30

Instruction on how to cage is usually found where?

On the body of the parking brake chamber

From a licensed mechanic

From the carrier

With the vehicle's manual

28 / 30

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

A warning light activates

The pressure gauge activates

Nothing

The spring parking brakes will be activated

29 / 30

How many uses does the relay valve have?

One

Four

Three

Two

30 / 30

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

None of these

Closing the control valse

Opening the control valve

Releasing the foot valve

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Air Brake Practice Test 04

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