LIGHT SNOW ON ROADS WHEN I APPROACHED A STOP SIGN. APPROACHED SLOWLY AND BEGAN TO LIGHTLY APPLY THE BRAKES. FELT/HEARD ABS ENGAGE WHEN THE BRAKE PEDAL LOST ALL RESISTANCE AND WENT TO THE FLOOR. BEGAN FRANTICLY PUMPING THE BRAKES AND, AFTER APPROXIMATELY 10 PUMPS, THEY RETURNED. PULLED AWAY FROM INTERSECTION AND LIGHTLY APPLIED BRAKES ON A DRY AREA OF PAVEMENT; SAME RESULT AS ABOVE. ABS INDICATOR LIGHT IS NOT ON. IMMEDIATELY TOOK VEHICLE TO A REPAIR FACILITY (PUMPING MY LEG OFF EVERY TIME I HAD TO DECREASE SPEED) AND THEY FOUND NO ISSUE. STATED THE PROBLEM IS LIKELY WITH THE ABS HCU (AS THEY HAD SEEN THE SAME ISSUE OCCUR ON A LINCOLN MKS). PEDAL RESTORED TO NORMAL WHILE TRAVELING HOME FROM SHOP.**UPDATED 9/28/16 TWO DAYS AFTER I REPORTED THE ORIGINAL INCIDENT, I WAS DRIVING MY MORNING COMMUTE AND BEGAN TO BRAKE AS I APPROACHED A BUSY INTERSECTION (THREE DIRECTIONS OF TRAFFIC BUT ONLY 1 DIRECTION HAS TO STOP). VERY SMALL SPOTS OF UNMELTED SNOW WERE PRESENT ON THE ROAD AND AGAIN, THE BRAKE PEDAL WENT TO THE FLOOR. I ALSO WENT BEYOND MY DESIRED STOPPING POINT ON THIS OCCASION, AS WELL. IN FACT, THE VEHICLE ONLY STOPPED BECAUSE I WRECKED INTO THE BACK OF ANOTHER VEHICLE THAT WAS WAITING TO TURN.*SMCH