MY SON WAS DRIVING AT 5 PM IN STOP AND GO TRAFFIC. HE HAD BEEN CUT OFF BY A DRIVER WHO THEN SLAMMED ON THEIR BRAKES. (OUT OF TOWN DRIVER) WHEN THE CAR AHEAD OF HIM STOPPED MY SON WAS DRIVING AT APPROX 30 MILES PER HOUR. MY SON SLAMMED ON HIS BRAKES WITH TWO CAR LENGTHS AHEAD OF HIM AND THE G6 REAR ENDED THE CAR AHEAD OF HIM. WHEN I WAS CONTACTED MY SON REPORTED THE CAR PANIC BRAKE ASSIST FEATURE DID NOT SEEM TO WORK. HE INDICATED THE CAR WAS NOT STOPPING DESPITE HIS HARD BRAKING. WE HAVE HAD NEW BRAKES INSTALLED ON THIS CAR IN FEBRUARY 2014. MY CONCERN: A GM RECALL 13036 WAS ISSUED AND PARTS WERE UNAVAILABLE.TO CORRECT THIS PANIC ASSIST BRAKING FEATURES. THE ACCIDENT TOOK PLACE ON 9/3/14 AND I RECEIVED A LETTER ON 9/5/14 INDICATING PARTS TO CORRECT THIS WERE AVAILABLE. MY SON HAS NEVER HAD A TRAFFIC CITATION OR WARNING AND IS NOW CONSIDERED RESPONSIBLE FOR THE ACCIDENT. MOST LIKELY THE CAR HAS BEEN TOTALED. *TR