This allows the trailer brakes to be operated independently of the car brakes. Cargo’s hydrastar trailer brake actuators deliver the industry’s fastest response time to provide maximum braking safety for your towed trailer/vehicle. Trailer Brakes - Electric Vs Mechanical Trailer Brakes A2b Trailers A heavy duty circuit fed through the trailers connecting plug and socket then triggers the trailers brakes. How do electric trailer brakes work australia . Uneven braking occurs when the length of the wire between each of the magnet connections adds resistance and therefore creates a difference in braking performance at each wheel. The trailer or caravan brakes will not work unless you have an electric brake controller in your car. Electric trailer brakes require a brake controller. Electric over hydraulic set up, where an electronic control module applies power to a hydraulic brake actuator. The electricity to the brakes is controlled via the brake controller and brake light ci...