This is our Florida Air Brakes Practice Quiz and Practice Test compiled of 25 questions each. Each question is worth four points for a total of 100 possible points. A passing score is 80%.
The Air Brakes Practice Quiz reveals the correct answer during each question to help you study for the actual Air Brakes exam. The Air Brakes Practice Test doesn’t reveal the correct answers until the test is over.
The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.
Press the start button to begin your free Air Brakes Practice Quiz. Good luck!
Air Brakes CDL Practice Quiz
Start
Congratulations! You have completed the Air Brakes CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
What two substances usually found in compressed air are harmful to the brake system?
A
Water and compressor oil.
B
Compressed air does not contain any of these substances.
C
Dust and water.
D
Dust and compressor oil.
Question 2
When should the air tanks be drained?
A
Once a week.
B
Before every trip.
C
Once a day.
D
Every 1,000 miles.
Question 3
The most common type of foundation brakes are ______ brakes.
A
disc
B
shoe
C
s-cam drum
D
wedge
Question 4
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, emergency brake systems
B
disc brake, emergency brake systems
C
disc brake, parking brake systems
D
service brake, parking brake systems
Question 5
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
evaporate any alcohol, which can damage the brake system
B
remove fuel from the air lines
C
reduce the risk of ice in the air brake valves
D
remove oil from the air lines
Question 6
In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.
A
three, sixty
B
one, sixty
C
one, thirty
D
two, sixty
Question 7
In an air brake system, the air compressor pumps air into the ______.
A
brake system
B
storage tanks
C
air tank drains
D
hydraulic brakes
Question 8
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
safety valve.
B
governor.
C
air tank drain.
D
application pressure gauge.
Question 9
Compressed air is let out of the system by ______.
A
letting up on the brake pedal
B
activating the parking brake
C
activating the emergency brake
D
pushing down on the brake pedal
Question 10
The safety valve in the air compressor tank should open at ______ psi.
A
125
B
175
C
150
D
200
Question 11
What is a good indication that your truck's single brake system needs to be adjusted?
A
When the compressor shuts off between 70 to 90 psi.
B
When the governor switch stops between 75 to 90 psi.
C
When pressure increases from 85 to 100 psi within 45 seconds.
D
When pressure increases from 50 to 75 psi within three minutes.
Question 12
What should you do when you see the low pressure warning?
A
Check your air pressure gauge and drive at highway speeds.
B
Safely bring the automobile to a stop while you still have control over the brakes.
C
Pump the brake pedal hard until you come to a stop.
D
Stay calm and wait for the air brakes to come on automatically.
Question 13
The service brake system:
A
is only found on automobiles with hydraulic brakes.
B
applies and releases the vehicle's brakes using the brake pedal.
C
is known as an official vehicle inspection.
D
is only on automobiles with hydraulic brakes.
Question 14
The supply pressure gauge is used for what purpose?
A
None of these.
B
To let you know how much oxygen is in the air tanks.
C
To let you know how much diesel fuel is in the vehicle.
D
To let you know how much water is in the air tank.
Question 15
Air brake systems are a combination of which three braking systems?
A
The parking brake system, service brake system, and emergency brake system.
B
The emergency brake system, parking brake system, and foundation brake system.
C
The service brake system, manual brake system, and disc brake system.
D
The disc brake system, drum brake system, and foundation brake system.
Question 16
What will happen if your air compressor stops working?
A
You will instantly lose braking power.
B
You will still have some air pressure left in the air tanks.
C
Nothing will happen.
D
Your brakes will instantly lock up.
Question 17
Spring brakes are ______.
A
specialized brakes only to be used during warm weather
B
springs that press the brakes on to stop the vehicle if the air brakes leak out
C
the spring that is attached to the brake pedal
D
used for parking
Question 18
Air tanks must be drained to:
A
drain oil and moisture from the tank.
B
prevent someone from moving the vehicle.
C
prevent them from freezing during cold temperatures.
D
completely empty air out of the tank.
Question 19
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
valve spring, shoes
B
pressure valve, boots
C
coil, boots
D
s-cam, shoes
Question 20
The air storage tanks are used to hold ______.
A
compressed gas
B
oxygen and helium
C
compressed air
D
nitrogen and oxygen
Question 21
What does it mean when the safety valve releases air?
A
There is way too much air in the air compressor.
B
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
C
The air pressure has exceeded 150 psi.
D
All of these.
Question 22
Brake drums are:
A
used to hold the brake shoes and linings.
B
bolted securely to the wheels.
C
all of these.
D
located on either end of the vehicle's axles.
Question 23
When should the parking brake not be used?
A
When the air pressure is low.
B
When the brakes are hot.
C
When the temperature is below freezing.
D
When the combined weight of your truckload and vehicle exceeds five tons.
Question 24
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 25
Are front wheel brakes good under all conditions?
A
Only if they are drum brakes.
B
No.
C
Yes.
D
Only if they are disc brakes.
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All done
"Dude, Go Back to Truck Driving School" because you FAILED!
"A Bad Truck Driver" because you FAILED!
ad Truck Driver!"
"An Amateur Truck Driver" because you FAILED!
"A Good Truck Driver" because you PASSED!
"A Truck Driving Pro" because you PASSED!
Remember, the Air Brakes Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.
Press the start button to begin your free Air Brakes Practice Test. Good luck!
Air Brakes CDL Practice Test
Start
Congratulations! You have completed the Air Brakes CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
The service brake system:
A
is only on automobiles with hydraulic brakes.
B
applies and releases the vehicle's brakes using the brake pedal.
C
is known as an official vehicle inspection.
D
is only found on automobiles with hydraulic brakes.
Question 2
Compressed air is let out of the system by ______.
A
activating the parking brake
B
letting up on the brake pedal
C
pushing down on the brake pedal
D
activating the emergency brake
Question 3
When should the air tanks be drained?
A
Once a day.
B
Every 1,000 miles.
C
Before every trip.
D
Once a week.
Question 4
What will happen if your air compressor stops working?
A
You will instantly lose braking power.
B
Nothing will happen.
C
Your brakes will instantly lock up.
D
You will still have some air pressure left in the air tanks.
Question 5
What should you do when you see the low pressure warning?
A
Safely bring the automobile to a stop while you still have control over the brakes.
B
Stay calm and wait for the air brakes to come on automatically.
C
Check your air pressure gauge and drive at highway speeds.
D
Pump the brake pedal hard until you come to a stop.
Question 6
Air brake systems are a combination of which three braking systems?
A
The service brake system, manual brake system, and disc brake system.
B
The emergency brake system, parking brake system, and foundation brake system.
C
The parking brake system, service brake system, and emergency brake system.
D
The disc brake system, drum brake system, and foundation brake system.
Question 7
When should the parking brake not be used?
A
When the brakes are hot.
B
When the temperature is below freezing.
C
When the combined weight of your truckload and vehicle exceeds five tons.
D
When the air pressure is low.
Question 8
The safety valve in the air compressor tank should open at ______ psi.
A
125
B
175
C
150
D
200
Question 9
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
disc brake, parking brake systems
B
service brake, emergency brake systems
C
disc brake, emergency brake systems
D
service brake, parking brake systems
Question 10
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
evaporate any alcohol, which can damage the brake system
B
remove oil from the air lines
C
reduce the risk of ice in the air brake valves
D
remove fuel from the air lines
Question 11
In an air brake system, the air compressor pumps air into the ______.
A
brake system
B
hydraulic brakes
C
storage tanks
D
air tank drains
Question 12
Spring brakes are ______.
A
the spring that is attached to the brake pedal
B
springs that press the brakes on to stop the vehicle if the air brakes leak out
C
used for parking
D
specialized brakes only to be used during warm weather
Question 13
The supply pressure gauge is used for what purpose?
A
To let you know how much diesel fuel is in the vehicle.
B
To let you know how much oxygen is in the air tanks.
C
None of these.
D
To let you know how much water is in the air tank.
Question 14
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 15
What is a good indication that your automobile's single brake system needs to be adjusted?
A
When the compressor shuts off between 70 to 90 psi.
B
When pressure increases from 50 to 75 psi within three minutes.
C
When the governor switch stops between 75 to 90 psi.
D
When pressure increases from 85 to 100 psi within 45 seconds.
Question 16
Air tanks must be drained to:
A
prevent them from freezing during cold temperatures.
B
completely empty air out of the tank.
C
prevent someone from moving the vehicle.
D
drain oil and moisture from the tank.
Question 17
The most common type of foundation brakes are ______ brakes.
A
disc
B
shoe
C
s-cam drum
D
wedge
Question 18
Brake drums are:
A
all of these.
B
located on either end of the vehicle's axles.
C
used to hold the brake shoes and linings.
D
bolted securely to the wheels
Question 19
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
s-cam, shoes
B
pressure valve, boots
C
valve spring, shoes
D
coil, boots
Question 20
The air storage tanks are used to hold ______.
A
compressed air
B
oxygen and helium
C
compressed gas
D
nitrogen and oxygen
Question 21
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
application pressure gauge.
B
governor.
C
air tank drain.
D
safety valve.
Question 22
What does it mean when the safety valve releases air?
A
The air pressure has exceeded 150 psi.
B
All of these.
C
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
D
There is way too much air in the air compressor.
Question 23
In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.
A
one, sixty
B
one, thirty
C
two, sixty
D
three, sixty
Question 24
What two substances usually found in compressed air are harmful to the brake system?
A
Compressed air does not contain any of these substances.
B
Water and compressor oil.
C
Dust and compressor oil.
D
Dust and water.
Question 25
Are front wheel brakes good under all conditions?
A
Yes.
B
Only if they are disc brakes.
C
No.
D
Only if they are drum brakes.
Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results
There are 25 questions to complete.
←
List
→
Return
Shaded items are complete.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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Hint
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minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
"Dude, Go Back to Truck Driving School" because you FAILED!
