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
In an air brake system, the air compressor pumps air into the ______.
A
air tank drains
B
hydraulic brakes
C
storage tanks
D
brake system
Question 2
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
Your brakes will instantly lock up.
D
Nothing will happen.
Question 3
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 4
What should you do when you see the low pressure warning?
A
Pump the brake pedal hard until you come to a stop.
B
Safely bring the automobile to a stop while you still have control over the brakes.
C
Check your air pressure gauge and drive at highway speeds.
D
Stay calm and wait for the air brakes to come on automatically.
Question 5
The air storage tanks are used to hold ______.
A
nitrogen and oxygen
B
compressed air
C
compressed gas
D
oxygen and helium
Question 6
Brake drums are:
A
located on either end of the vehicle's axles.
B
all of these.
C
bolted securely to the wheels.
D
used to hold the brake shoes and linings.
Question 7
What does it mean when the safety valve releases air?
A
There is way too much air in the air compressor.
B
The air pressure has exceeded 150 psi.
C
All of these.
D
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
Question 8
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 9
Compressed air is let out of the system by ______.
A
activating the emergency brake
B
letting up on the brake pedal
C
activating the parking brake
D
pushing down on the brake pedal
Question 10
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
s-cam, shoes
B
coil, boots
C
valve spring, shoes
D
pressure valve, boots
Question 11
What two substances usually found in compressed air are harmful to the brake system?
A
Water and compressor oil.
B
Dust and compressor oil.
C
Compressed air does not contain any of these substances.
D
Dust and water.
Question 12
The most common type of foundation brakes are ______ brakes.
A
s-cam drum
B
shoe
C
wedge
D
disc
Question 13
When should the parking brake not be used?
A
When the temperature is below freezing.
B
When the combined weight of your truckload and vehicle exceeds five tons.
C
When the air pressure is low.
D
When the brakes are hot.
Question 14
What is a good indication that your truck's single brake system needs to be adjusted?
A
When pressure increases from 50 to 75 psi within three minutes.
B
When the compressor shuts off between 70 to 90 psi.
C
When pressure increases from 85 to 100 psi within 45 seconds.
D
When the governor switch stops between 75 to 90 psi.
Question 15
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 16
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
reduce the risk of ice in the air brake valves
B
remove fuel from the air lines
C
remove oil from the air lines
D
evaporate any alcohol, which can damage the brake system
Question 17
Spring brakes are ______.
A
used for parking
B
springs that press the brakes on to stop the vehicle if the air brakes leak out
C
specialized brakes only to be used during warm weather
D
the spring that is attached to the brake pedal
Question 18
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
safety valve.
C
air tank drain.
D
governor.
Question 19
Are front wheel brakes good under all conditions?
A
Only if they are drum brakes.
B
Yes.
C
Only if they are disc brakes.
D
No.
Question 20
When should the air tanks be drained?
A
Once a week.
B
Before every trip.
C
Every 1,000 miles.
D
Once a day.
Question 21
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, thirty
B
one, sixty
C
three, sixty
D
two, sixty
Question 22
The safety valve in the air compressor tank should open at ______ psi.
A
175
B
200
C
125
D
150
Question 23
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
disc brake, parking brake systems
C
disc brake, emergency brake systems
D
service brake, emergency brake systems
Question 24
The service brake system:
A
is only found on automobiles with hydraulic brakes.
B
is only on automobiles with hydraulic brakes.
C
is known as an official vehicle inspection.
D
applies and releases the vehicle's brakes using the brake pedal.
Question 25
Air tanks must be drained to:
A
completely empty air out of the tank.
B
prevent them from freezing during cold temperatures.
C
drain oil and moisture from the tank.
D
prevent someone from moving the vehicle.
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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
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 2
The service brake system:
A
applies and releases the vehicle's brakes using the brake pedal.
B
is only on automobiles with hydraulic brakes.
C
is only found on automobiles with hydraulic brakes.
D
is known as an official vehicle inspection.
Question 3
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
service brake, parking brake systems
D
disc brake, emergency brake systems
Question 4
Are front wheel brakes good under all conditions?
A
Only if they are disc brakes.
B
Yes.
C
Only if they are drum brakes.
D
No.
Question 5
When should the air tanks be drained?
A
Once a day.
B
Every 1,000 miles.
C
Once a week.
D
Before every trip.
Question 6
Spring brakes are ______.
A
used for parking
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
specialized brakes only to be used during warm weather
Question 7
The air storage tanks are used to hold ______.
A
nitrogen and oxygen
B
compressed gas
C
oxygen and helium
D
compressed air
Question 8
Brake drums are:
A
used to hold the brake shoes and linings.
B
all of these.
C
located on either end of the vehicle's axles.
D
bolted securely to the wheels
Question 9
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 10
What does it mean when the safety valve releases air?
A
All of these.
B
There is way too much air in the air compressor.
C
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
D
The air pressure has exceeded 150 psi.
Question 11
When should the parking brake not be used?
A
When the temperature is below freezing.
B
When the brakes are hot.
C
When the combined weight of your truckload and vehicle exceeds five tons.
D
When the air pressure is low.
Question 12
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
remove fuel from the air lines
B
evaporate any alcohol, which can damage the brake system
C
reduce the risk of ice in the air brake valves
D
remove oil from the air lines
Question 13
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
pressure valve, boots
B
coil, boots
C
s-cam, shoes
D
valve spring, shoes
Question 14
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 15
Compressed air is let out of the system by ______.
A
activating the emergency brake
B
letting up on the brake pedal
C
activating the parking brake
D
pushing down on the brake pedal
Question 16
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
Pump the brake pedal hard until you come to a stop.
C
Check your air pressure gauge and drive at highway speeds.
D
Stay calm and wait for the air brakes to come on automatically.
Question 17
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
two, sixty
C
one, sixty
D
one, thirty
Question 18
In an air brake system, the air compressor pumps air into the ______.
A
storage tanks
B
air tank drains
C
brake system
D
hydraulic brakes
Question 19
The supply pressure gauge is used for what purpose?
A
To let you know how much water is in the air tank.
B
To let you know how much diesel fuel is in the vehicle.
C
None of these.
D
To let you know how much oxygen is in the air tanks.
Question 20
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
True
B
False
Question 21
The most common type of foundation brakes are ______ brakes.
A
disc
B
s-cam drum
C
shoe
D
wedge
Question 22
The safety valve in the air compressor tank should open at ______ psi.
A
175
B
200
C
150
D
125
Question 23
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 24
What two substances usually found in compressed air are harmful to the brake system?
A
Dust and water.
B
Compressed air does not contain any of these substances.
C
Dust and compressor oil.
D
Water and compressor oil.
Question 25
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 85 to 100 psi within 45 seconds.
C
When the governor switch stops between 75 to 90 psi.
D
When pressure increases from 50 to 75 psi within three minutes.
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.
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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
Time allowed
minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
"Dude, Go Back to Truck Driving School" because you FAILED!
