FOOT SOLELY ON BRAKE AS VEHICLE COMING TO A STOP IN PARKING SPOT SUDDENLY WITH NO REASON ACCELERATED OVER-RIDING THE PRESSURE ON THE BRAKE--JUMPING THE CONCRETE STOP-KNOCKING OVER PARKING POST AND SIGN AND COMING TO A STOP JUST HITTING THE OPPOSING VEHICLE'S LEFT FRONT WHEEL WELL DOING DAMAGE TO IT AND TO MY CAR.