NEW. Tekonsha 8507120 Brakeman IV, Time-Delay Brake Controller. The Tekonsha 8507120 Brakeman IV is a time-delay brake controller designed for trailers. It is black in color, made of ABS and plastic materials, and has a digital display. This trailer brake controller has a vintage part of no, with a manufacturer part number of 8507120, and a brand of Tekonsha. It is suitable for 12V vehicle electrical systems, has a universal fitment, and weighs 9.6 ounces. The controller is activated type time-based and has a matte finish, making it a reliable and durable accessory for towing needs.