North Carolina Air Brakes Practice Test
This is our North 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
Question 1 |
A | Once a day. |
B | Once a week. |
C | Before every trip. |
D | Every 1,000 miles. |
Question 2 |
A | 125 |
B | 200 |
C | 175 |
D | 150 |
Question 3 |
A | Only if they are disc brakes. |
B | Yes. |
C | Only if they are drum brakes. |
D | No. |
Question 4 |
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 5 |
A | Dust and water. |
B | Compressed air does not contain any of these substances. |
C | Water and compressor oil. |
D | Dust and compressor oil. |
Question 6 |
A | service brake, parking brake systems |
B | service brake, emergency brake systems |
C | disc brake, parking brake systems |
D | disc brake, emergency brake systems |
Question 7 |
A | brake system |
B | air tank drains |
C | storage tanks |
D | hydraulic brakes |
Question 8 |
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 9 |
A | springs that press the brakes on to stop the vehicle if the air brakes leak out |
B | used for parking |
C | the spring that is attached to the brake pedal |
D | specialized brakes only to be used during warm weather |
Question 10 |
A | completely empty air out of the tank. |
B | drain oil and moisture from the tank. |
C | prevent them from freezing during cold temperatures. |
D | prevent someone from moving the vehicle. |
Question 11 |
A | all of these. |
B | located on either end of the vehicle's axles. |
C | bolted securely to the wheels. |
D | used to hold the brake shoes and linings. |
Question 12 |
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 13 |
A | coil, boots |
B | valve spring, shoes |
C | s-cam, shoes |
D | pressure valve, boots |
Question 14 |
A | When the temperature is below freezing. |
B | When the air pressure is low. |
C | When the combined weight of your truckload and vehicle exceeds five tons. |
D | When the brakes are hot. |
Question 15 |
A | remove oil from the air lines |
B | remove fuel from the air lines |
C | reduce the risk of ice in the air brake valves |
D | evaporate any alcohol, which can damage the brake system |
Question 16 |
A | False |
B | True |
Question 17 |
A | shoe |
B | s-cam drum |
C | wedge |
D | disc |
Question 18 |
A | is known as an official vehicle inspection. |
B | is only found on automobiles with hydraulic brakes. |
C | is only on automobiles with hydraulic brakes. |
D | applies and releases the vehicle's brakes using the brake pedal. |
Question 19 |
A | All of these. |
B | Something is malfunctioning, and you should have the vehicle checked by a mechanic. |
C | There is way too much air in the air compressor. |
D | The air pressure has exceeded 150 psi. |
Question 20 |
A | You will still have some air pressure left in the air tanks. |
B | Nothing will happen. |
C | You will instantly lose braking power. |
D | Your brakes will instantly lock up. |
Question 21 |
A | safety valve. |
B | application pressure gauge. |
C | air tank drain. |
D | governor. |
Question 22 |
A | compressed air |
B | nitrogen and oxygen |
C | oxygen and helium |
D | compressed gas |
Question 23 |
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 24 |
A | three, sixty |
B | two, sixty |
C | one, sixty |
D | one, thirty |
Question 25 |
A | Check your air pressure gauge and drive at highway speeds. |
B | Pump the brake pedal hard until you come to a stop. |
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. |
← | List | → |
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 |
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
Question 1 |
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 2 |
A | service brake, emergency brake systems |
B | service brake, parking brake systems |
C | disc brake, parking brake systems |
D | disc brake, emergency brake systems |
Question 3 |
A | No. |
B | Only if they are disc brakes. |
C | Yes. |
D | Only if they are drum brakes. |
Question 4 |
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 | Stay calm and wait for the air brakes to come on automatically. |
D | Check your air pressure gauge and drive at highway speeds. |
Question 5 |
A | True |
B | False |
Question 6 |
A | safety valve. |
B | governor. |
C | air tank drain. |
D | application pressure gauge. |
Question 7 |
A | The emergency brake system, parking brake system, and foundation brake system. |
B | The service brake system, manual brake system, and disc 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 8 |
A | When the governor switch stops between 75 to 90 psi. |
B | When pressure increases from 85 to 100 psi within 45 seconds. |
C | When the compressor shuts off between 70 to 90 psi. |
D | When pressure increases from 50 to 75 psi within three minutes. |
Question 9 |
A | located on either end of the vehicle's axles. |
B | used to hold the brake shoes and linings. |
C | bolted securely to the wheels |
D | all of these. |
Question 10 |
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 11 |
A | Once a week. |
B | Every 1,000 miles. |
C | Before every trip. |
D | Once a day. |
Question 12 |
A | 150 |
B | 200 |
C | 175 |
D | 125 |
Question 13 |
A | There is way too much air in the air compressor. |
B | All of these. |
C | Something is malfunctioning, and you should have the vehicle checked by a mechanic. |
D | The air pressure has exceeded 150 psi. |
Question 14 |
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 15 |
A | reduce the risk of ice in the air brake valves |
B | remove oil from the air lines |
C | evaporate any alcohol, which can damage the brake system |
D | remove fuel from the air lines |
Question 16 |
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. |
Question 17 |
A | nitrogen and oxygen |
B | oxygen and helium |
C | compressed gas |
D | compressed air |
Question 18 |
A | s-cam drum |
B | wedge |
C | disc |
D | shoe |
Question 19 |
A | pressure valve, boots |
B | coil, boots |
C | s-cam, shoes |
D | valve spring, shoes |
Question 20 |
A | storage tanks |
B | air tank drains |
C | hydraulic brakes |
D | brake system |
Question 21 |
A | To let you know how much oxygen is in the air tanks. |
B | To let you know how much water is in the air tank. |
C | None of these. |
D | To let you know how much diesel fuel is in the vehicle. |
Question 22 |
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 23 |
A | activating the parking brake |
B | activating the emergency brake |
C | pushing down on the brake pedal |
D | letting up on the brake pedal |
Question 24 |
A | one, sixty |
B | three, sixty |
C | one, thirty |
D | two, sixty |
Question 25 |
A | You will still have some air pressure left in the air tanks. |
B | Nothing will happen. |
C | You will instantly lose braking power. |
D | Your brakes will instantly lock up. |
← | List | → |
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 |
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