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Based on official Iowa exam questions

IA CDL Air Brakes Marathon

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements.

Ready for something a little different? This Iowa CDL Air Brakes Marathon is a massive practice test that contains a mixture of all 183 questions that we have available for this IA endorsement. If you give an incorrect 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”. Give it your best shot!

12 min to complete
Available in EN and ES
IA commercial driver's license
Real exam-style pitfalls you’ll practice:
Common Traps
Distractors
Trick Wording
Double Negatives
This test is a Premium member exclusive. You'll get

All 650 exam-like questions specific to Iowa

Interactive learning with AI personal tutor

Unique 360° Virtual Road Simulations

Get your money back if you don’t pass

Verified for accuracy: October 2025

Reviewed by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy

What to expect on the actual IA exam

25

questions

20

correct answers to pass

80%

passing score

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