South Carolina Air Brakes Practice Test
This is our South Carolina 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 |
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A | air tank drain. |
B | safety valve. |
C | application pressure gauge. |
D | governor. |
Question 2 |
In an air brake system, the air compressor pumps air into the ______.
A | storage tanks |
B | hydraulic brakes |
C | air tank drains |
D | brake system |
Question 3 |
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 oil from the air lines |
C | remove fuel from the air lines |
D | evaporate any alcohol, which can damage the brake system |
Question 4 |
Air tanks must be drained to:
A | drain oil and moisture from the tank. |
B | prevent someone from moving the vehicle. |
C | completely empty air out of the tank. |
D | prevent them from freezing during cold temperatures. |
Question 5 |
The air storage tanks are used to hold ______.
A | nitrogen and oxygen |
B | oxygen and helium |
C | compressed air |
D | compressed gas |
Question 6 |
What is a good indication that your truck's single brake system needs to be adjusted?
A | When pressure increases from 85 to 100 psi within 45 seconds. |
B | When pressure increases from 50 to 75 psi within three minutes. |
C | When the compressor shuts off between 70 to 90 psi. |
D | When the governor switch stops between 75 to 90 psi. |
Question 7 |
The safety valve in the air compressor tank should open at ______ psi.
A | 175 |
B | 200 |
C | 150 |
D | 125 |
Question 8 |
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 | two, sixty |
D | three, sixty |
Question 9 |
What two substances usually found in compressed air are harmful to the brake system?
A | Dust and compressor oil. |
B | Compressed air does not contain any of these substances. |
C | Water and compressor oil. |
D | Dust and water. |
Question 10 |
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A | False |
B | True |
Question 11 |
The service brake system:
A | is only found on automobiles with hydraulic brakes. |
B | is only on automobiles with hydraulic brakes. |
C | applies and releases the vehicle's brakes using the brake pedal. |
D | is known as an official vehicle inspection. |
Question 12 |
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A | service brake, parking brake systems |
B | service brake, emergency brake systems |
C | disc brake, emergency brake systems |
D | disc brake, parking brake systems |
Question 13 |
What does it mean when the safety valve releases air?
A | Something is malfunctioning, and you should have the vehicle checked by a mechanic. |
B | All of these. |
C | There is way too much air in the air compressor. |
D | The air pressure has exceeded 150 psi. |
Question 14 |
Spring brakes are ______.
A | springs that press the brakes on to stop the vehicle if the air brakes leak out |
B | specialized brakes only to be used during warm weather |
C | the spring that is attached to the brake pedal |
D | used for parking |
Question 15 |
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 16 |
When should the parking brake not be used?
A | When the air pressure is low. |
B | When the temperature is below freezing. |
C | When the combined weight of your truckload and vehicle exceeds five tons. |
D | When the brakes are hot. |
Question 17 |
Compressed air is let out of the system by ______.
A | letting up on the brake pedal |
B | activating the emergency brake |
C | pushing down on the brake pedal |
D | activating the parking brake |
Question 18 |
Brake drums are:
A | used to hold the brake shoes and linings. |
B | bolted securely to the wheels. |
C | located on either end of the vehicle's axles. |
D | all of these. |
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 |
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 service brake system, manual brake system, and disc brake system. |
C | The disc brake system, drum brake system, and foundation brake system. |
D | The emergency brake system, parking brake system, and foundation brake system. |
Question 21 |
When should the air tanks be drained?
A | Before every trip. |
B | Once a day. |
C | Every 1,000 miles. |
D | Once a week. |
Question 22 |
The most common type of foundation brakes are ______ brakes.
A | disc |
B | wedge |
C | shoe |
D | s-cam drum |
Question 23 |
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 | Stay calm and wait for the air brakes to come on automatically. |
D | Pump the brake pedal hard until you come to a stop. |
Question 24 |
Are front wheel brakes good under all conditions?
A | Only if they are disc brakes. |
B | Only if they are drum brakes. |
C | No. |
D | Yes. |
Question 25 |
What will happen if your air compressor stops working?
A | You will instantly lose braking power. |
B | Your brakes will instantly lock up. |
C | You will still have some air pressure left in the air tanks. |
D | Nothing will happen. |
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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| End |
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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 |
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 | two, sixty |
C | one, thirty |
D | three, sixty |
Question 2 |
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A | air tank drain. |
B | application pressure gauge. |
C | governor. |
D | safety valve. |
Question 3 |
The safety valve in the air compressor tank should open at ______ psi.
A | 125 |
B | 175 |
C | 200 |
D | 150 |
Question 4 |
What will happen if your air compressor stops working?
A | Nothing will happen. |
B | You will still have some air pressure left in the air tanks. |
C | You will instantly lose braking power. |
D | Your brakes will instantly lock up. |
Question 5 |
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 | evaporate any alcohol, which can damage the brake system |
C | remove oil from the air lines |
D | remove fuel from the air lines |
Question 6 |
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, parking brake systems |
C | service brake, parking brake systems |
D | disc brake, emergency brake systems |
Question 7 |
Compressed air is let out of the system by ______.
A | letting up on the brake pedal |
B | activating the emergency brake |
C | pushing down on the brake pedal |
D | activating the parking brake |
Question 8 |
The most common type of foundation brakes are ______ brakes.
A | wedge |
B | s-cam drum |
C | shoe |
D | disc |
Question 9 |
Brake drums are:
A | used to hold the brake shoes and linings. |
B | bolted securely to the wheels |
C | located on either end of the vehicle's axles. |
D | all of these. |
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 |
What two substances usually found in compressed air are harmful to the brake system?
A | Dust and compressor oil. |
B | Dust and water. |
C | Water and compressor oil. |
D | Compressed air does not contain any of these substances. |
Question 12 |
The service brake system:
A | is only on automobiles with hydraulic brakes. |
B | is only found on automobiles with hydraulic brakes. |
C | applies and releases the vehicle's brakes using the brake pedal. |
D | is known as an official vehicle inspection. |
Question 13 |
Are front wheel brakes good under all conditions?
A | Only if they are disc brakes. |
B | No. |
C | Yes. |
D | Only if they are drum brakes. |
Question 14 |
Spring brakes are ______.
A | specialized brakes only to be used during warm weather |
B | used for parking |
C | springs that press the brakes on to stop the vehicle if the air brakes leak out |
D | the spring that is attached to the brake pedal |
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 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. |
Question 16 |
In an air brake system, the air compressor pumps air into the ______.
A | storage tanks |
B | brake system |
C | air tank drains |
D | hydraulic brakes |
Question 17 |
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A | True |
B | False |
Question 18 |
When should the parking brake not be used?
A | When the temperature is below freezing. |
B | When the air pressure is low. |
C | When the brakes are hot. |
D | When the combined weight of your truckload and vehicle exceeds five tons. |
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 |
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 21 |
Air tanks must be drained to:
A | completely empty air out of the tank. |
B | prevent someone from moving the vehicle. |
C | drain oil and moisture from the tank. |
D | prevent them from freezing during cold temperatures. |
Question 22 |
When should the air tanks be drained?
A | Before every trip. |
B | Once a day. |
C | Once a week. |
D | Every 1,000 miles. |
Question 23 |
Air brake systems are a combination of which three braking systems?
A | The emergency brake system, parking brake system, and foundation brake system. |
B | The parking brake system, service brake system, and emergency brake system. |
C | The disc brake system, drum brake system, and foundation brake system. |
D | The service brake system, manual brake system, and disc brake system. |
Question 24 |
The air storage tanks are used to hold ______.
A | nitrogen and oxygen |
B | compressed air |
C | oxygen and helium |
D | compressed gas |
Question 25 |
What should you do when you see the low pressure warning?
A | Stay calm and wait for the air brakes to come on automatically. |
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 | Pump the brake pedal hard until you come to a stop. |
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 |
| End |
Return
You have completed
questions
question
Your score is
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Partial-Credit
You have not finished your quiz. If you leave this page, your progress will be lost.
Correct Answer
You Selected
Not Attempted
Final Score on Quiz
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Attempted Questions Wrong
Questions Not Attempted
Total Questions on Quiz
Question Details
Results
Date
Score
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!
"A Bad Truck Driver" because you FAILED!
"An Amateur Truck Driver" because you FAILED!
"A Good Truck Driver" because you PASSED!
"A Truck Driving Pro" because you PASSED!
Back to South Carolina CDL Practice Test
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