WHILE HARD BRAKING JUMPED A CURB TO AVOID A CAR, REAR PASSENGER HIT FRONT SEAT. THE SEAT BELT BROKE FREE FROM THE BUCKLE. THE BUCKLE WAS MESSED UP WITH RED PLASTIC PARTS ALL OVER THE REAR SEATS. THE PASSENGER WAS AN ADULT ~ 150LBS. WE ALL WERE SEAT BLETS FOR SAFETY BUT THE BUCKLE IN THE EXPLORER BURSTED APART-- THIS IS NOT A SAFE SITUATION. IF THERE HAD BEEN A COLISION THE DRIVER AND THE PASSENGER COULD HAS SUFFERED SERIOUS INJURY. THE SEAT BELT BUCKLE SYSTEM NEED LOOKING INTO. I STILL HAVE THE PLASTIC PARTS IF ONE WANT TO SEE THEM. TERRY WADE. *AK