In Partnership with Berthoud High School Library

FREE CO CDL Air Brakes Marathon 2018

Need one final boost? This Colorado CDL Air Brakes Marathon is a new study tool that contains a mixture of all 119 questions that we have available for this CO endorsement. If you select a wrong answer, we’ll remember that question and will display it to you again at the end of the exam 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. As you work your way through the Marathon, you’ll notice that unlike the other Colorado CDL practice tests there are no explanations and no hints here. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Good luck!

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