WAS DRIVING ABOUT 45MPH WHEN HAD TO BRAKE SUDDENLY. UPON BRAKING, THE REAR SEAT FLIPPED FORWARD & HIT THE FRONT OCCUPANTS IN THE BACK & HEAD. BOTH WERE SLIGHTLY INJURED. TOOK TO DEALERSHIP & WAS INFORMED BY THE MECHANIC THAT A PIN BOLT HAD BEEN SHEARED OFF AT THE TIME OF THE SUDDEN BRAKING THAT CAUSED THE SEAT TO FLIP. STILL HAVE THE BOLT.