PERPETUAL REAR BRAKE FAILURE DUE TO LEAKING REAR AXLE GREASE SEALS WHICH THROW GREASE ONTO REAR BRAKE SHOES. SOAKING THEM AND RENDERING THEM USELESS AND INNEFECTIVE. CAUSING UNSAFE BRAKING. ACCORDING TO TOYOTA DEALER, AND SEARS AUTO SERVICE IN DOVER, DELAWARE., REPAIRS SIMILAR TO THIS ARE BEING PERFORMED ON SIMILAR VINTAGE TOYOTA FOUR RUNNER MODELS ON A WEEKLY BASIS. THE AVERAGE REPAIR COST IS OVER $1000,. THIS APPEARS TO BE A VEHICLE MANUFACTURERS DEFECT NOT A STANDARD MAINTENANCE ISSUE AND COULD RESULT IN INJURIES OR DEATH. I HAD NO BRAKE POWER IN A NUMBER OF EMERGENCY SITUATIONS, IN OTHERS MY BRAKING DISTANCE INCREASED DRAMATICALLY, IN A FEW CASES, I'VE HAD THE REPAIRS DONE BUT THE PROBLEM HAS RETURNED,.