VEHICLE WAS BACKED INTO DRIVEWAY, PARKED WITH ENGINE OFF. DRIVER INTENDED TO RELOCATE VEHICLE ABOUT 6 FEET FORWARD, NEVER ENTER STREET. DRIVER STARTED ENGINE, AND WITH RIGHT FOOT ON BRAKE PEDAL PLACED TRANSMISSION IN DRIVE. DRIVER RELEASED BRAKE PEDAL AND ALLOWED VEHICLE TO MOVE FORWARD TO INTENDED PARKING SPOT WHERE HE APPLIED THE BRAKES WITH THE RIGHT FOOT. THE VEHICLE DID NOT STOP, DRIVER PLACED BOTH FEET ON THE BRAKE PEDAL BUT VEHICLE STILL WOULD NOT STOP, ROLLED INTO THE STREET AND STRUCK A PASSING VEHICLE. VEHICLE WAS TOWED TO DEALER, BUT DEALER COULD NOT FIND ANYTHING WRONG. FORD CONSUMER APPEALS BOARD WAS CONTACTED, BUT AGREED WITH THE DEALER. VEHICLE OWNER CONTACTED A PRIVATE MECHANIC AND WAS TOLD THAT THE MOST LIKELY FAILURE THAT COULD CAUSE THE SYMPTOMS EXPERIENCED WAS THE POWER BOOSTER UNIT. VEHICLE WAS TOWED TO INSURANCE COMPANY LOT WHERE IT WILL BE EXAMINED FOR POSSIBLE SUBROGATION WITH THE MANUFACTURER. OWNER HAS PICTURES OF THE DRIVEWAY AND SIDEWALK SHOWING TIRE MARKS LEADING RIGHT TO THE CRASH SITE.*AK