OK, lately I have been getting feedback in my brake pedal when stopping and it happens at random not everytime. It feels like the pedal is pushing back and I feel/hear a grinding noise (its NOT the calipers or pads) but the noise/feeling is only in the pedal. It will happen, then if I take my foot off the pedal, pump the brakes it stops but the ABS light will come on the dashboard. Could this be a bad sensor somewhere??? I took the sensor out of the front drivers wheel and cleaned it and its still happening. any advice is VERY appriciated!!!