2006 NISSAN XTERRA User Comment / Complaint

This is in regards to a 2006 nissan xterra. the vehicle had a catastrophic failure of the power steering system which resulted in the truck veering off a bridge. there were no obvious issued with the vehicle leading up to the event. the truck had just received its 30,000 mile service and was in great mechanical condition. after leaving our driveway and less than a mile from our house, my wife came to a stop at a small bridge then made a left turn across the bride. while halfway across the bridge, she heard a loud "bang" and then the truck completely lost control of the steering. the truck veered to the right and into the stone wall of the bridge, broke through the wall and landed in a ditch. thankfully she was not terribly hurt. now despite the fact that the vehicle simply broke in some defective manner, neither the manufacturer or our insurance company is willing to research what went wrong. they just want to repair the vehicle and put it back on the road. but what if it is repaired with the same defective materials?