Question Truck tractors with air brakes built on or after March 1, 1997 must have: Answers An Anti-Lock Braking System (ABS). Bluetooth. A GPS. Explanation Truck tractors with air brakes built on or after March 1, 1997, and other vehicles with air brakes built on or after March 1, 1998, must be equipped with anti-lock brakes. Take a FREE Practice Test Now This questions appears in the following tests: Iowa Knowledge Test Class A , Kentucky Knowledge Test Class A , Rhode Island Knowledge Test Class B , Louisiana Air Brakes , Montana Air Brakes , Oklahoma Air Brakes , Virginia Air Brakes , Washington Air Brakes ,