This is a FREE Practice Exam
If you want to drive a truck or bus with air brakes, or pull a trailer with air brakes, you need to read this section. If you want to pull a trailer with air brakes, you also need to read the section on Combination Vehicles. Air brakes use compressed air to make the brakes work. Air brakes are a good and safe way of stopping large and heavy vehicles, but the brakes must be well maintained and used properly.
These CDL tests are in FREE Practice Quiz MODE:
NOTE:Â This section is limited on the questions and it is recommended to purchase the full practice exam to obtain the questionnaire in it’s entirety, to better help you understand the material and get you prepared for the CDL Permit Exam.