Illinois CDL Air Brakes Practice Test (IL) 2021

Better than any Illinois drivers manual! Nail the CDL written test with this new air brakes practice test! 20 new questions to take you another step forward!

  • 20 Questions
  • 80% Passing Score
  • 4 Mistakes Allowed
94% of students found this test helpful!
Rated 4.7 out of 5 by 15 drivers

Illinois CDL Test Facts

  • Questions: 50
  • Correct answers to pass: 40
  • Passing score: 80%
  • Test locations: Secretary of State (SOS) Offices
  • Test languages: English, Spanish
  • Based upon: Illinois CDL Book
Improve your chances of passing the test by reading the official Illinois drivers manual Drivers Manual

If you are applying for a Class A or Class B commercial driving learners permit in Chicago, Rockford, Champaign or elsewhere in the state, you’re going to need the free Class A and Class B practice test for Illinois we offer on this page. This quiz is specifically designed to help aspiring commercial drivers prepare for and pass the SOS CDL air brakes test, which is mandatory for all drivers of the two higher-weight classes. By law, all modern Class B and Class A vehicles must be fitted with an air brake system to help drivers control the speed of otherwise heavy and unmanageable vehicles. Driving most box-trucks, livestock transportation vehicles, tank vehicles, school buses and multiple-trailer vehicles will require a pass on the CDL air brake test for Illinois drivers. Use this Illinois CDL practice test air brakes quiz in conjunction with the official permit test study guide and you can secure this pass in no time.

The air brakes or L endorsement is the only mandatory license add-on for Class B commercial drivers, though you may need other qualifications for certain occupations. If you are aiming to drive very large Class A vehicles, you will also need our Combination Vehicles Class A license Illinois practice test to help you get ready for the compulsory combination vehicles endorsement exam. All trainee commercial drivers must pass the general knowledge test CDL Illinois exam with a score of 40 correct questions or higher, prior to applying for any additional license endorsements. Don’t worry if you have yet to tackle this first hurdle! We also offer a top-quality Illinois CDL general knowledge practice test here on, which will get your general knowledge permit test preparation off to a flying start. Once that initial challenge has been dealt with, you can return to our 2021 air brake practice test, if you are certain you will need an L endorsement for your chosen driving role.

This Illinois air practice test is intended for use alongside the permit test study guide and should not be thought of as a stand-alone resource. From the dedicated Air Brakes endorsement section in the permit book, you will learn about single and dual air brake systems, air brake components and repair, maintaining pressure and draining air tanks, vehicle inspection considerations and stopping distances in fine detail. Once you have begun the learning process, you can spend some time applying this new and unfamiliar knowledge to real Illinois air test practice questions here on our quiz. Working in this way will simultaneously reinforce what you have learned and make sure you hold the information for longer. Regular use of the driving practice test for Illinois applicants can substantially increase your chances of passing the air brakes endorsement DMV permit test first time!

Much of the content included on this CDL air brakes practice test has appeared on real-life endorsement test papers at some point in the past – very few other websites can provide DMV written test content this authentic! Our team also take steps to guarantee the ongoing accuracy and relevance of our material, by comparing it to current information in the 2021 permit book. There are some wonderful images and helpful study aids built in to the DMV learners permit practice test for Illinois air brake applicants, that can help to remedy any weaknesses in your knowledge, while making learning a more enjoyable and relaxing experience. Don’t just take our word for it – try the quiz today and see for yourself!