DRIVING A RENTED 2010 CHEVY COBALT LT, 4 DOOR. HAD RENTED THE VEHICLE FROM ALAMO RENTAL CARS ON 7/2/11 THE ACCIDENT HAPPENED ON 7/6/11. MY WIFE AND I WERE DRIVING ON I-4 EAST JUST OUTSIDE ORLANDO, FLA. WHEN THE DRIVER IN FRONT OF ME PUT ON HIS BRAKES, I APPLIED THE BRAKES ON THE COBALT AND IMMEDIATELY THE CAR WAS VIOLENTLY OUT OF CONTROL. THE CAR GOING OUT OF CONTROL WAS SO VIOLENT I THOUGHT WE HAD BEEN HIT FROM THE REAR. ONCE THE CAR WENT OUT OF CONTROL I COULD NOT CONTROL IT AT ALL. WE CROSSED ALL 3 LANES OF FREEWAY AND HIT THE LEFT REAR TANDEM WHEELS OF AN 18 WHEELER. THE CAR FINALLY CAME TO A STOP IN THE CENTER LANE FACING IN THE OPPOSITE DIRECTION OF TRAFFIC FLOW. JUST A FEW MORE INCHES TOWARD THE PASSENGER COMPARTMENT WHEN CONTACT WAS MADE WITH THE 18 WHEELER AND THIS WOULD HAVE BEEN A FATAL ACCIDENT. I HAVE BEEN BEATING MYSELF UP TRYING TO FIGURE OUT WHY JUST APPLYING THE BRAKES WOULD CAUSE SUCH A VIOLENT AND UNCONTROLLABLE TURN OF EVENTS. THEN I STARTED RESEARCH ON THE WEB AND FOUND THAT BRAKE ISSUES WITH THE COBALT IS NOT A NEW ISSUE. THERE IS DATA ON BRAKE PROBLEMS AND INDIVIDUALS ACCOUNTS OF WHAT HAPPENED TO THEM WHEN THEIR COBALTS WENT OUT OF CONTROL JUST FROM APPLYING THE BRAKES. MANY OF THESE ACCOUNTS STATED THAT DEALERS FOUND NO PROBLEMS WITH THE BRAKES FOLLOWING THESE INSTANCES OF GOING OUT OF CONTROL AND IN MANY CASES BEING INVOLVED IN ACCIDENTS. THIS WAS THE MOST HORRIFIC INCIDENT MY WIFE AND I HAVE EVER BEEN INVOLVED IN AND THE REALITY IS THAT WE WERE INVOL