OWNER PARKED VEHICLE ON SLIGHT (20%) INCLINE AND PUT ON EMERGENCY BRAKES. VEHICLE PARKED FOR 15 MINUTES WHEN OWNER, STANDING NEXT TO VEHICLE, HEARD CREAKING NOISES. AFTER THE NOISE STOPPED VEHICLE STARTED TO ROLL FORWARD, AND HIT A TREE. HAD VEHICLE TOWED TO DEALER, BUT MECHANIC COULD NOT LOCATE ANY PROBLEMS WITH EMERGENCY BRAKES.*AK