WHEN SON APPLIED THE BRAKES TO STOP IN AN EMERGENCY SITUATION THE PEDAL WENT TO FLOOR AND THE VEHICLE WOULD NOT STOP. DRIVER HAD TO USE THE EMERGENCY BRAKES TO STOP THE VEHICLE. DRIVER WAS INVOLVED IN A CRASH BECAUSE OF THIS. VEHICLE WAS TOWED TO A BODY SHOP, WHERE THE BRAKE BOOSTER ROD CLIP WAS FOUND BROKEN. THE VEHICLE HAS NOT BEEN REPAIRED. *AK