1.TRAVELING ABOUT 20-30MPH ON THE FREEWAY UNDER SLOW TRAFFIC CONDITION 2.THE CAR WAS CRUISING ABUT 20-25MPH AT THE POINT OF ACCIDENT. I NEEDED TO REDUCE SPEED AS TRAFFIC GET SLOWER, BUT BRAKE DID NOT FUNCTION PROPERLY. PRESSED BRAKE HARD BUT THE CAR WAS STILL ROLLING AND REAR ENDED THE CAR FRONT OF ME TWICE, BECAUSE MY CAR COULD NOT STOP UNTIL HIT REAR END TWICE I STRONGLY BELIEVE THIS INCIDENT RELATED TO PREVIOUS NHTSA CAMPAIGN NUMBER: 13V454000. *TR