Genuine AL-KO breakaway cable. AL-KO part number; 1220984.Fitted after early 2004 Fits most AL-KO braked couplings. UK Law requires that all trailer and caravans with brakes built on or after 1/10/82 are fitted with a safety device to provide protection in the unlikely event of the separation of the coupling while in motion. The purpose of a breakaway cable is to apply the trailers brakes if it becomes separated from the towing vehicle. Having done this, the cable assembly is designed to part, allowing the trailer to come to a halt away from the towing vehicle.