Question To confirm that a trailer has ABS, you can: Answers Look under the trailer for wheel speed sensors coming from the back of the brakes. Look under the hood for the ABS sticker. Look at the tires. Remove a tire and look for the ABS sensor on the axle. Explanation If you are unsure if a trailer is equipped with an Anti-Lock Braking System (ABS), look under the vehicle for the electronic control unit and wheel speed sensor wires coming from the back of the brakes. Take a FREE Practice Test Now This questions appears in the following tests: New Jersey Knowledge Test Class A , North Carolina Knowledge Test Class A , Connecticut Knowledge Test Class B , Georgia Knowledge Test Class B , Oregon Knowledge Test Class B , Delaware Air Brakes , New Hampshire Air Brakes ,