I just put all new wheel bearings, seals, wheel cylinders, shoes and hardware and all new brake lines and hose from the RABS dump valve on back. Also installed a new ABS sensor on the differential in my F250 with 10.25 rear. I've always had the abs light on last year or so. It used to be intermittent, so I figured I'd replace the ABS or VSS (which ever its actually called) in the rear diff housing. I checked the code and its coming up with a code 7 from what I can tell. It flashes so fast it kinda throws me off. Code 7 is YELLOW REAR ABS light. Code description: No isolate valve self test. What does that mean? The light stays on weather the truck moves or not, as soon as I turn the key the light is on and stays on.