I WAS EASING OUR 2015 JEEP GRAND CHEROKEE INTO A PARKING SPOT AT A TRAIL HEAD PARKING LOT WITH MY FOOT ON THE BRAKE PEDAL. I FULLY ENGAGED THE BRAKE PEDAL TO STOP THE VEHICLE, AND THE VEHICLE ACCELERATED AT FULL THROTTLE OVER THE TOP OF A 2.5 FT BY 2.5 FT CEMENT BLOCK PARKING BARRIER. IT DRAGGED THE CEMENT BLOCK ABOUT 20-25 FT. I CONTINUED TO PRESS THE BRAKE AND AFTER ABOUT 40 FT, THE VEHICLE CAME TO A STOP. I IMMEDIATELY TURNED THE VEHICLE OFF. IT WAS TERRIFYING NOT TO BE IN CONTROL OF THE VEHICLE. FORTUNATELY, NO ONE WAS INJURED. DAMAGE TO THE VEHICLE IS YET TO BE DETERMINED, BUT EVEN IF IT IS REPAIRED, THERE IS NO WAY I WOULD FEEL COMFORTABLE DRIVING IT AGAIN. THIS VEHICLE SHOULD BE TOTALED AND NOT RESOLD TO ANYONE ELSE. I HAVE BEEN A LOYAL JEEP OWNER FOR OVER 20 YEARS, BUT I AM NOT SURE I WOULD PURCHASE ANOTHER ONE, ESPECIALLY NOW THAT I HAVE RESEARCHED THE ISSUE AND REALIZE THAT THIS IS A RARE BUT REOCCURRING PROBLEM WITH THE JEEP GRAND CHEROKEE FOR 20+ YEARS.