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