IL CDL Air Brakes Marathon
Original questions by our team Based on 2026 IL CDL Handbook
Ready for something a little different? This Illinois CDL Air Brakes Marathon is a gargantuan study tool that contains a mix of all 183 questions that we have available for this IL endorsement. If you make a mistake, we’ll remember that question and will display it to you again at the very end of the Marathon until you’ve answered that question correctly. In other words, the Marathon will cycle through your missed questions until you answer each one correctly. You must make a 100% to pass. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Good luck!