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...

Keep the engine running between 600 and 900 rpm

Stop the engine and leave the transmission in the lowest gear

Block the wheels

Park on level ground

2 / 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

3 / 30

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

Letting them cool

Turning them up

Turning them down

Winding them off

4 / 30

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

To improve vehicle mileage

None of these

Reduce the braking effort to the front wheels

To reduce the speed of the vehicle without braking

5 / 30

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

The two-way valve

The quick release valve

The relay valve

The one-way valve

6 / 30

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

Spring pressure

None of these

Air pressure

Hydraulics

7 / 30

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

Compressing the spring with a caging bolt

Releasing the air pressure

Finding out which spring has to be caged

Releasing the spring

8 / 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 weight and speed of the vehicle

The adjustment of the service brakes

The spring force of the spring brakes that have been installed

9 / 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 50%

Less than 20%

10 / 30

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

The activated position

The resting position

The forward position

The release position

11 / 30

The effectiveness of the spring parking brake depends on what?

The size of the spring

The pressure the spring provides

The service brake adjustment

The type of brakes

12 / 30

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

Blocking the wheels

Draining the wet tank

Turning off the compressor

Releasing the two-way valve

13 / 30

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

Nothing happens

It retracts

It does not expand

It does expand

14 / 30

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

Wet

Normal

Rough

Smooth

15 / 30

The spring parking brake system can also act as what?

Hydraulic brakes

Air-over hydraulic brakes

Service brakes for the trailers

An emergency brake

16 / 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 beside the chamber body

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

17 / 30

What is an automatic limiting valve?

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 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

18 / 30

What is meant by compounding?

The force applied when the air pressure is below 35 psi

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 by the service brakes when the vehicle is fully stopped

19 / 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

20 / 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

Crack or warp

None of these

Fall off

21 / 30

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

There is no danger

They could get stuck

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

They could break

22 / 30

What is another word for when the spring compresses?

Downsizes

Cages

Shrinks

Pushes

23 / 30

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

The vehicle owner

A qualified mechanic or technician

The driver

All of the above

24 / 30

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

A fan

Nothing

A dust cap

A filter

25 / 30

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

The brakes no longer grab

The brake temperature gauge has a level reading

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

There is no longer any smoke coming from the brakes

26 / 30

How many uses does the relay valve have?

Two

One

Four

Three

27 / 30

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

Opening the control valve

Closing the control valse

None of these

Releasing the foot valve

28 / 30

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

Nothing

The pressure gauge activates

A warning light activates

The spring parking brakes will be activated

29 / 30

Instruction on how to cage is usually found where?

On the body of the parking brake chamber

From a licensed mechanic

With the vehicle's manual

From the carrier

30 / 30

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

Missing

Wrong size

Manually caged

Expanded

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Air Brake Practice Test 04

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