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 is another word for when the spring compresses?

Cages

Downsizes

Pushes

Shrinks

2 / 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

Fall off

Crack or warp

3 / 30

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

Releasing the spring

Compressing the spring with a caging bolt

Releasing the air pressure

Finding out which spring has to be caged

4 / 30

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

It does not expand

It does expand

It retracts

Nothing happens

5 / 30

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

The resting position

The release position

The forward position

The activated position

6 / 30

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

Opening the control valve

None of these

Closing the control valse

Releasing the foot valve

7 / 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

8 / 30

What is meant by compounding?

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

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

The force applied by the spring brakes and the service brake

9 / 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

Park on level ground

Keep the engine running between 600 and 900 rpm

10 / 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

11 / 30

The spring parking brake system can also act as what?

An emergency brake

Hydraulic brakes

Air-over hydraulic brakes

Service brakes for the trailers

12 / 30

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

Letting them cool

Turning them down

Turning them up

Winding them off

13 / 30

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

The driver

The vehicle owner

A qualified mechanic or technician

All of the above

14 / 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 type of spring brakes

The adjustment of the service brakes

The spring force of the spring brakes that have been installed

15 / 30

How many uses does the relay valve have?

Two

Four

Three

One

16 / 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

To reduce the speed of the vehicle without braking

Reduce the braking effort to the front wheels

17 / 30

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

Wet

Normal

Smooth

Rough

18 / 30

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

Manually caged

Expanded

Missing

Wrong size

19 / 30

How are the brakes caged?

With a valve that releases the spring

With a bolt that runs beside the chamber body

With a twist of the release valve

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

20 / 30

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

The trailer service brakes

The trailer spring brakes

None of these

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

21 / 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

22 / 30

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

A fan

Nothing

A filter

A dust cap

23 / 30

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

There is no danger

They could get stuck

They could break

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

24 / 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 15 to 20 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

25 / 30

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

The spring parking brakes will be activated

A warning light activates

Nothing

The pressure gauge activates

26 / 30

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

Releasing the two-way valve

Draining the wet tank

Blocking the wheels

Turning off the compressor

27 / 30

Instruction on how to cage is usually found where?

From a licensed mechanic

With the vehicle's manual

From the carrier

On the body of the parking brake chamber

28 / 30

Is the installation of spring parking brakes and their piping arrangements done the same in all vehicle air brake systems?

All but fire trucks

All but tandem trailers

Yes

29 / 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%

30 / 30

The effectiveness of the spring parking brake depends on what?

The service brake adjustment

The size of the spring

The type of brakes

The pressure the spring provides

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Air Brake Practice Test 04

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