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CO CDL Air Brakes Marathon

Part of mandatory Entry-Level Driver Training Course Based on 2024 CO commercial driver's license manual Available in EN, ES

What to expect on the actual CO CDL exam

  • 25questions
  • 20correct answers to pass
  • 80%passing score

Need one final boost? This Colorado CDL Air Brakes Marathon is a new study tool that contains a mixture of all 183 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. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Good luck!

To fully understand the Air Brakes endorsement process and to master the material for the written exam, explore our detailed guides on the Air Brake endorsement and the Air Brakes written test.

For our strict accuracy and quality standards, see our Commitment to Accuracy.
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CO commercial driver's license

Perfect for

  • First-time CO CDL and CLP applicants
  • CDL holders adding endorsements
  • CO CDL renewal applicants

Helpful resources

CO CDL Handbook

View the most recent (2024) official CO CDL Handbook.

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CO CDL Practice Test App

Download our free iOS or Android app and practice for your driving test offline or on the go.

10 Things You Should Do Before Your Driving Knowledge Exam (PDF)

Many people do their best but still get to the DMV overconfident and underprepared because they fail to do some of the simple...

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