This is our online CDL test for air brakes for you to practice before you take the real exam at your state?s local DMV for your CDL permit. Take this CDL practice test as many times as it takes for you to get a perfect score and feel free to come back as many times as you like to try our other practice exams!


Question 1 of 16

It is mandatory that all vehicles with air brakes have a low air pressure warning signal.

  • False

  • True

  • Only some vehicles