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

. 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

2 / 30

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

Compressing the spring with a caging bolt

Finding out which spring has to be caged

Releasing the spring

Releasing the air pressure

3 / 30

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

The brake temperature gauge has a level reading

The brakes no longer grab

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

There is no longer any smoke coming from the brakes

4 / 30

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

Rough

Wet

Normal

Smooth

5 / 30

What is meant by compounding?

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

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

6 / 30

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

Missing

Expanded

Manually caged

Wrong size

7 / 30

The effectiveness of the spring parking brake depends on what?

The type of brakes

The service brake adjustment

The pressure the spring provides

The size of the spring

8 / 30

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

To reduce the speed of the vehicle without braking

None of these

To improve vehicle mileage

Reduce the braking effort to the front wheels

9 / 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

10 / 30

The spring parking brake system can also act as what?

Air-over hydraulic brakes

Service brakes for the trailers

An emergency brake

Hydraulic brakes

11 / 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

12 / 30

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

Draining the wet tank

Blocking the wheels

Turning off the compressor

Releasing the two-way valve

13 / 30

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

All of the above

The vehicle owner

The driver

A qualified mechanic or technician

14 / 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

None of these

Crack or warp

Fall off

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

Stop the engine and leave the transmission in the lowest gear

Park on level ground

16 / 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 twist of the release valve

With a bolt that runs beside the chamber body

With a valve that releases the spring

17 / 30

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

The activated position

The resting position

The release position

The forward position

18 / 30

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

The relay valve

The two-way valve

The one-way valve

The quick release valve

19 / 30

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

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

They could break

There is no danger

They could get stuck

20 / 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

21 / 30

How many uses does the relay valve have?

Four

Three

Two

One

22 / 30

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

Turning them up

Turning them down

Winding them off

Letting them cool

23 / 30

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

The pressure gauge activates

A warning light activates

Nothing

The spring parking brakes will be activated

24 / 30

What is another word for when the spring compresses?

Cages

Pushes

Downsizes

Shrinks

25 / 30

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

Less than 50%

Less than 60%

Less than 45%

Less than 20%

26 / 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 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 25 to 30 psi, depending on how it has been pre-set

27 / 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

28 / 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

29 / 30

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

It does not expand

Nothing happens

It does expand

It retracts

30 / 30

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

Opening the control valve

None of these

Releasing the foot valve

Closing the control valse

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Air Brake Practice Test 04

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