i have a 24' gooseneck flatbed. recently the brakes(electric) quit working, parking lights and turn signals work fine, but will fade and brown out when you push the brake pedal. my controller box is working fine, still operates like it should with other trailers. brakes do not catch at all, even when using the emergency slide on the box. you can hear a high pitched buzz when you push the brake pedal, but brakes just don't work. this ever happened to anybody?