WAS DRIVING VEHICLE 25MPH ON BACK ROAD WHICH WAS SLIGHTLY TO THE LEFT. STARTED TURNING STEERING WHEEL TO FOLLOW ROAD, AND HAD NO STEERING. HAD TO SLAM ON BRAKES TO STOP, BUT VEHICLE FAILED TO STOP IN TIME. VEHICLE KEPT STRAIGHT, AND WENT UP AN EMBANKMENT. THIS CAUSED VEHICLE TO FLIP OVER. OWNER TRIED TO BRACE HIMSELF BY PUTTING ARM OUT, AND VEHICLE ROLLED OVER OWNER'S HAND. HAD EMERGENCY TREATMENT. *AK THE PITMAN ARM CAME LOOSE FROM THE STEERING BOX. *SLC