This is the first of our seven Air Brakes CDL practice tests. Please take all of the practice tests to increase your chance of doing well on the actual test!
Our free Air Brakes CDL practice test contains 10 questions. There is no time limit on the test. You must answer every question.
You’re welcome to retake this test as many times as you’d like. If you want to improve your score or just need more practice, click the ‘Restart Quiz’ button at the end of the test. The questions will be displayed 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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The 3 braking systems are __________.CorrectIncorrect
What makes the brakes work?CorrectIncorrect
What is the function of the air compressor?CorrectIncorrect
The air compressor governor controls __________.CorrectIncorrect
Air storage tanks must hold how much air?CorrectIncorrect
What can happen to the brakes if oil and water collect in the air tanks?CorrectIncorrect
If your truck doesn’t have automatic tank drains, when should you drain the air tanks?CorrectIncorrect
Where is the air tank drain valve located?CorrectIncorrect
The two types of air tank drains are __________.CorrectIncorrect
What does an alcohol evaporator do?CorrectIncorrect