Question What happens if you don’t pass the air brakes endorsement test? Answers You won’t be permitted to drive a vehicle with air brakes. Your CDL will include an air brake endorsement marked with an asterisk. Your CDL will be invalid. Explanation If you do not take or pass the air brakes test, you will be restricted to operating vehicles without air brakes. Take a FREE Practice Test Now This questions appears in the following tests: Louisiana Knowledge Test Class A , South Carolina Knowledge Test Class A , Kentucky Knowledge Test Class B ,