Question What helps prevent wheel lockup when braking? Answers An Anti-Lock Braking System (ABS) Air brakes An alternator Explanation The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied. Take a FREE Practice Test Now This questions appears in the following tests: Michigan Knowledge Test Class A , Oklahoma Knowledge Test Class A , Iowa Knowledge Test Class B , Nevada Double , Alaska Air Brakes , Connecticut Air Brakes , Ohio Air Brakes , Washington Air Brakes ,