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