I WAS DRIVING OUT OF A PARKING LOT AT 10-15MPH. A CAR WAS WAITING TO TURN AT A STOP SIGN 200 FEET AHEAD. THE ROAD HAD MILD SNOW AND ICE AND WAS ON A 20 DEGREE SLOPE, SO I STEPPED GENTLY ON THE BRAKE. THERE WAS NO RESPONSE FROM THE CAR. I STEPPED OFF THE BRAKE AND STEPPED DOWN A LITTLE HARDER. THERE WAS MILD RESPONSE. I CONTINUED PUSHING ON THE BRAKE, AND WAS ABLE TO PUSH ALL THE WAY DOWN TO THE FLOOR. THE CAR DID NOT STOP. 50 FEET BEFORE COLLISION, I ATTEMPTED TURNING THE WHEEL TO GET OUT OF THE WAY, BUT THE CAR ONLY SHIFTED 3 FEET BEFORE I COLLIDED WITH THE FRONT CAR. 50 MINUTES AFTER THE INCIDENT, I WAS DRIVING THE SAME CAR HOME AT 25MPH. THE CITY STREET WAS FLAT AND STRAIGHT, AND THERE WAS MILD SNOW AND ICE. A CAR WAS TURNING RIGHT AT AN INTERSECTION 250 FT AHEAD. I WAS WORRIED THIS TIME, AND PRESSED ON THE BRAKE EARLIER AT MODERATE PRESSURE (PEDAL HALF DOWN). IN THE PAST, THAT TYPE OF PRESSURE COULD DECREASE THE CAR FROM 35 TO 10MPH IN 100FT. THIS TIME, THE CAR ONLY DECREASED FROM 25 TO 15MPH IN 245FT. I WAS LUCKY THE DRIVER AHEAD TURNED, BECAUSE IT WOULD HAVE BEEN A SECOND COLLISION IN ONE DAY. *TR