Industry leading Hydrastar® Electric Over Hydraulic (EOH) Trailer Mounted Brake Actuators are easy to install and meet all Department of Transportation (D.O.T.) braking requirements. With this complete installation kit, you leave the guess-work behind. Hydrastar® has improved the stopping performance for trailers hauling horses, cars, construction, farm equipment and boats, to provide maximum braking safety, in the industry’s fastest response time.