Question A truck tractor built after March 1, 1997 must be equipped with: Answers An Anti-Lock Braking System (ABS). A flag. Hydraulic brakes. Explanation Truck tractors with air brakes built on or after March 1, 1997 are required to be equipped with Anti-Lock Braking Systems (ABS). Take a FREE Practice Test Now This questions appears in the following tests: Hawaii Knowledge Test Class A ,