What is needed for drvers license renewal?

This can depend if you are trying to get your class A or class b. I actually have a class b license with hazmat and tanker endorsement. One thing you need to do is go to your drivers license center and get a cdl learning book and look over the chapters required to get the type of license you are trying to get. You will have to look over the air brakes chapter, along with all of the other chapters required for the class you are trying to seek. If you are trying to get your class A you will have to also look over the combination section along with air brakes. Then go to your testing center and take the test on the computer there. Then if you pass then you can set up an appointment to take the driving test.