I WAS APPROACHING A LIGHT WHERE A VEHICLE WAS MOVING BUT SUDDENLY STOPPED BECAUSE OF TRAFFIC AHEAD. WHEN I APPLIED MY BRAKES, THE BRAKE WHEN IMMEDIATELY TO THE FLOORBOARD AND THERE WAS A CLICK. MY CAR DID NOT SLOW DOWN BUT SLID DIRECTLY INTO THE CAR IN FRONT OF ME CAUSING FRONT END DAMAGE TO MY CAR. MY RATE OF SPEED WAS 25-30 MILES PER HOUR.