Not a Fusion, but my GMC had this awful rear-ABS system that just used a dump valve to reduce rear braking pressure. Well, my brake pedal was randomly going to the floor without much happening, and usually in traffic. So I just removed the whole ABS valve unit and control module, hooked the rear brake line up straight to the proportioning valve, and did a good bleeding. Now the brakes are perfect. I'm not saying you should jump to removing the entire ABS system, but it sure is an option if it is more dangerous with ABS than without.