ABS warning light comes on mainly after an hour of fast driving without touching the brakes. On other occasions when I brake I hear a graunching noise from the front accompanied by small jolts from the front as if the car was tripping over a step accompanied by the ABS light sometimes but not always. Now sometimes I can drive around local all week without any problems. I have gone to a Garage immediately after this has happened and the car has ben put up on a lift but the mechanics could not find any problem. Maybe the only resort is diagnostics at a Ford dealers.