- New
81725 Hayes Syncronizer is an electronic brake controller designed to manage the electric brakes on trailers equipped with 2 or 4 brakes. It automatically adjusts the electrical power delivered to the trailer brakes according to brake pedal application, up to the preset power level. The manual slide control allows the driver to apply the trailer brakes independently when needed. It is designed for 12-volt, negative-ground tow vehicle electrical systems.