This is the first of seven different Air Brakes CDL practice tests that we offer. Please take all of our free practice tests to ensure that you score well on the big day! Air Brakes are complicated and require an extensive knowledge of your truck!
Our free Air Brakes CDL practice test contains 10 questions. You may not skip any of the questions. There is no time limit on the test. For maximum practice, we highly recommend taking each of our free CDL practice tests at least once.
Our CDL practice test database contains hundreds of questions. If you need more practice or want to improve your score, click the ‘Restart Quiz’ button at the end of the test. The questions will be presented in a different order but they’ll be the same questions you already answered. The second time around you should know the answers!
Feel free to retake this test as many times as you’d like. Once you receive your score there will be a button to View Questions. Wrong answers will be highlighted in red. The correct answer will be in a green box outlined in green.
Being the driver of a commercial vehicle is a huge responsibility. The written CDL test isn’t that bad. The actual driving test is rigorous. Inspectors do not want anyone on the road who isn’t capable of handling a big rig. Make sure you practice your driving and especially BACKING UP.
Congratulations on your decision to become a commercial driver!
Air Brakes CDL Practice Test 1
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Question 1 of 10
The 3 braking systems are __________.CorrectIncorrect
Question 2 of 10
What makes the brakes work?CorrectIncorrect
Question 3 of 10
What is the function of the air compressor?CorrectIncorrect
Question 4 of 10
The air compressor governor controls __________.CorrectIncorrect
Question 5 of 10
Air storage tanks must hold how much air?CorrectIncorrect
Question 6 of 10
What can happen to the brakes if oil and water collect in the air tanks?CorrectIncorrect
Question 7 of 10
If your truck doesn’t have automatic tank drains, when should you drain the air tanks?CorrectIncorrect
Question 8 of 10
Where is the air tank drain valve located?CorrectIncorrect
Question 9 of 10
The two types of air tank drains are __________.CorrectIncorrect
Question 10 of 10
What does an alcohol evaporator do?CorrectIncorrect