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