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 | Only if they are disc brakes. |
B | Only if they are drum brakes. |
C | Yes. |
D | No. |
Question 2 |
A | storage tanks |
B | hydraulic brakes |
C | air tank drains |
D | brake system |
Question 3 |
A | All of these. |
B | The air pressure has exceeded 150 psi. |
C | Something is malfunctioning, and you should have the vehicle checked by a mechanic. |
D | There is way too much air in the air compressor. |
Question 4 |
A | compressed gas |
B | oxygen and helium |
C | nitrogen and oxygen |
D | compressed air |
Question 5 |
A | Safely bring the automobile to a stop while you still have control over the brakes. |
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 | Pump the brake pedal hard until you come to a stop. |
Question 6 |
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 7 |
A | 200 |
B | 175 |
C | 125 |
D | 150 |
Question 8 |
A | True |
B | False |
Question 9 |
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 10 |
A | application pressure gauge. |
B | air tank drain. |
C | governor. |
D | safety valve. |
Question 11 |
A | disc |
B | wedge |
C | s-cam drum |
D | shoe |
Question 12 |
A | You will instantly lose braking power. |
B | Nothing will happen. |
C | You will still have some air pressure left in the air tanks. |
D | Your brakes will instantly lock up. |
Question 13 |
A | service brake, parking brake systems |
B | service brake, emergency brake systems |
C | disc brake, emergency brake systems |
D | disc brake, parking brake systems |
Question 14 |
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 the governor switch stops between 75 to 90 psi. |
D | When pressure increases from 85 to 100 psi within 45 seconds. |
Question 15 |
A | Once a day. |
B | Once a week. |
C | Every 1,000 miles. |
D | Before every trip. |
Question 16 |
A | Dust and compressor oil. |
B | Compressed air does not contain any of these substances. |
C | Dust and water. |
D | Water and compressor oil. |
Question 17 |
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 18 |
A | remove oil from the air lines |
B | evaporate any alcohol, which can damage the brake system |
C | reduce the risk of ice in the air brake valves |
D | remove fuel from the air lines |
Question 19 |
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 20 |
A | prevent them from freezing during cold temperatures. |
B | prevent someone from moving the vehicle. |
C | completely empty air out of the tank. |
D | drain oil and moisture from the tank. |
Question 21 |
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 22 |
A | three, sixty |
B | one, thirty |
C | one, sixty |
D | two, sixty |
Question 23 |
A | bolted securely to the wheels. |
B | used to hold the brake shoes and linings. |
C | located on either end of the vehicle's axles. |
D | all of these. |
Question 24 |
A | is only found on automobiles with hydraulic brakes. |
B | is only on automobiles with hydraulic brakes. |
C | applies and releases the vehicle's brakes using the brake pedal. |
D | is known as an official vehicle inspection. |
Question 25 |
A | coil, boots |
B | pressure valve, boots |
C | s-cam, shoes |
D | valve spring, shoes |
← | 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 | pushing down on the brake pedal |
B | activating the emergency brake |
C | activating the parking brake |
D | letting up on the brake pedal |
Question 2 |
A | two, sixty |
B | one, sixty |
C | three, sixty |
D | one, thirty |
Question 3 |
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 4 |
A | 175 |
B | 150 |
C | 200 |
D | 125 |
Question 5 |
A | wedge |
B | shoe |
C | disc |
D | s-cam drum |
Question 6 |
A | all of these. |
B | used to hold the brake shoes and linings. |
C | located on either end of the vehicle's axles. |
D | bolted securely to the wheels |
Question 7 |
A | Check your air pressure gauge and drive at highway speeds. |
B | Pump the brake pedal hard until you come to a stop. |
C | Safely bring the automobile to a stop while you still have control over the brakes. |
D | Stay calm and wait for the air brakes to come on automatically. |
Question 8 |
A | completely empty air out of the tank. |
B | prevent them from freezing during cold temperatures. |
C | prevent someone from moving the vehicle. |
D | drain oil and moisture from the tank. |
Question 9 |
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 10 |
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 | the spring that is attached to the brake pedal |
D | used for parking |
Question 11 |
A | remove oil 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 fuel from the air lines |
Question 12 |
A | Water and compressor oil. |
B | Compressed air does not contain any of these substances. |
C | Dust and water. |
D | Dust and compressor oil. |
Question 13 |
A | s-cam, shoes |
B | coil, boots |
C | valve spring, shoes |
D | pressure valve, boots |
Question 14 |
A | application pressure gauge. |
B | safety valve. |
C | governor. |
D | air tank drain. |
Question 15 |
A | The parking brake system, service brake system, and emergency 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 disc brake system, drum brake system, and foundation brake system. |
Question 16 |
A | compressed gas |
B | compressed air |
C | nitrogen and oxygen |
D | oxygen and helium |
Question 17 |
A | applies and releases the vehicle's brakes using the brake pedal. |
B | is only on automobiles with hydraulic brakes. |
C | is only found on automobiles with hydraulic brakes. |
D | is known as an official vehicle inspection. |
Question 18 |
A | service brake, parking brake systems |
B | disc brake, emergency brake systems |
C | service brake, emergency brake systems |
D | disc brake, parking brake systems |
Question 19 |
A | Yes. |
B | Only if they are drum brakes. |
C | Only if they are disc brakes. |
D | No. |
Question 20 |
A | air tank drains |
B | hydraulic brakes |
C | storage tanks |
D | brake system |
Question 21 |
A | Before every trip. |
B | Once a week. |
C | Every 1,000 miles. |
D | Once a day. |
Question 22 |
A | When the air pressure is low. |
B | When the temperature is below freezing. |
C | When the combined weight of your truckload and vehicle exceeds five tons. |
D | When the brakes are hot. |
Question 23 |
A | The air pressure has exceeded 150 psi. |
B | All of these. |
C | Something is malfunctioning, and you should have the vehicle checked by a mechanic. |
D | There is way too much air in the air compressor. |
Question 24 |
A | False |
B | True |
Question 25 |
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. |
← | 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 |