Question If a truck's Anti-Lock Braking System (ABS) is not working: Answers The truck will not have any brakes. The truck should be driven only at slow speeds. The truck will still have brakes. The truck will lack brakes on its left side. Explanation If an ABS system fails, the vehicle will still have normal braking function. The driver should continue to drive and brake as they normally would. Take a FREE Practice Test Now This questions appears in the following tests: South Dakota Knowledge Test Class A , New Jersey Knowledge Test Class B , North Dakota Knowledge Test Class B ,