This is the fourth 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 #4 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 4
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Question 1 of 10
What type of gauge is required for vehicles with air brakes?CorrectIncorrect
Question 2 of 10
What type of warning signal is required on vehicles with air brakes?CorrectIncorrect
Question 3 of 10
Which of the following are types of low air pressure warning devices?CorrectIncorrect
Question 4 of 10
In an air brake system, what is used to turn on the stop lights?CorrectIncorrect
Question 5 of 10
During normal driving, parking and emergency brakes are usually held back by __________.CorrectIncorrect
Question 6 of 10
The effectiveness of the spring brakes depends on the adjustment of what?CorrectIncorrect
Question 7 of 10
Why do some buses have a separate air tank to release spring brakes?CorrectIncorrect
Question 8 of 10
A dual air brake system has __________.CorrectIncorrect
Question 9 of 10
When checking an air compressor belt you should check for __________.CorrectIncorrect
Question 10 of 10
Before checking free play in manual slack adjusters you should __________.CorrectIncorrect