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 | air tank drain. |
B | governor. |
C | safety valve. |
D | application pressure gauge. |
Question 2 |
A | service brake, emergency brake systems |
B | disc brake, emergency brake systems |
C | service brake, parking brake systems |
D | disc brake, parking brake systems |
Question 3 |
A | pushing down on the brake pedal |
B | letting up on the brake pedal |
C | activating the parking brake |
D | activating the emergency brake |
Question 4 |
A | To let you know how much water is in the air tank. |
B | To let you know how much oxygen is in the air tanks. |
C | None of these. |
D | To let you know how much diesel fuel is in the vehicle. |
Question 5 |
A | reduce the risk of ice in the air brake valves |
B | remove fuel from the air lines |
C | evaporate any alcohol, which can damage the brake system |
D | remove oil from the air lines |
Question 6 |
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 7 |
A | No. |
B | Yes. |
C | Only if they are disc brakes. |
D | Only if they are drum brakes. |
Question 8 |
A | Your brakes will instantly lock up. |
B | You will still have some air pressure left in the air tanks. |
C | Nothing will happen. |
D | You will instantly lose braking power. |
Question 9 |
A | s-cam drum |
B | wedge |
C | shoe |
D | disc |
Question 10 |
A | three, sixty |
B | two, sixty |
C | one, thirty |
D | one, sixty |
Question 11 |
A | is only found 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 on automobiles with hydraulic brakes. |
Question 12 |
A | When the combined weight of your truckload and vehicle exceeds five tons. |
B | When the temperature is below freezing. |
C | When the brakes are hot. |
D | When the air pressure is low. |
Question 13 |
A | Every 1,000 miles. |
B | Once a week. |
C | Before every trip. |
D | Once a day. |
Question 14 |
A | The air pressure has exceeded 150 psi. |
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 | All of these. |
Question 15 |
A | Stay calm and wait for the air brakes to come on automatically. |
B | Pump the brake pedal hard until you come to a stop. |
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 16 |
A | air tank drains |
B | brake system |
C | storage tanks |
D | hydraulic brakes |
Question 17 |
A | valve spring, shoes |
B | coil, boots |
C | pressure valve, boots |
D | s-cam, shoes |
Question 18 |
A | False |
B | True |
Question 19 |
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 20 |
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 21 |
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 22 |
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 23 |
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 24 |
A | 125 |
B | 150 |
C | 175 |
D | 200 |
Question 25 |
A | compressed gas |
B | nitrogen and oxygen |
C | compressed air |
D | oxygen and helium |
← | 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 | Once a day. |
B | Once a week. |
C | Every 1,000 miles. |
D | Before every trip. |
Question 2 |
A | The air pressure has exceeded 150 psi. |
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 | All of these. |
Question 3 |
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 4 |
A | Only if they are disc brakes. |
B | Only if they are drum brakes. |
C | No. |
D | Yes. |
Question 5 |
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 6 |
A | compressed gas |
B | oxygen and helium |
C | nitrogen and oxygen |
D | compressed air |
Question 7 |
A | The disc brake system, drum brake system, and foundation brake system. |
B | The service brake system, manual brake system, and disc brake system. |
C | The emergency brake system, parking brake system, and foundation brake system. |
D | The parking brake system, service brake system, and emergency brake system. |
Question 8 |
A | one, thirty |
B | two, sixty |
C | three, sixty |
D | one, sixty |
Question 9 |
A | wedge |
B | disc |
C | s-cam drum |
D | shoe |
Question 10 |
A | When pressure increases from 50 to 75 psi within three minutes. |
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 the compressor shuts off between 70 to 90 psi. |
Question 11 |
A | False |
B | True |
Question 12 |
A | activating the emergency brake |
B | letting up on the brake pedal |
C | pushing down on the brake pedal |
D | activating the parking brake |
Question 13 |
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 14 |
A | To let you know how much diesel fuel is in the vehicle. |
B | To let you know how much water is in the air tank. |
C | To let you know how much oxygen is in the air tanks. |
D | None of these. |
Question 15 |
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 | Safely bring the automobile to a stop while you still have control over the brakes. |
D | Check your air pressure gauge and drive at highway speeds. |
Question 16 |
A | When the combined weight of your truckload and vehicle exceeds five tons. |
B | When the temperature is below freezing. |
C | When the brakes are hot. |
D | When the air pressure is low. |
Question 17 |
A | air tank drains |
B | hydraulic brakes |
C | storage tanks |
D | brake system |
Question 18 |
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 19 |
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 20 |
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 21 |
A | disc brake, emergency brake systems |
B | disc brake, parking brake systems |
C | service brake, parking brake systems |
D | service brake, emergency brake systems |
Question 22 |
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 23 |
A | 200 |
B | 150 |
C | 125 |
D | 175 |
Question 24 |
A | governor. |
B | air tank drain. |
C | application pressure gauge. |
D | safety valve. |
Question 25 |
A | valve spring, shoes |
B | s-cam, shoes |
C | coil, boots |
D | pressure valve, boots |
← | 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 |