DROVE CAR TO WORK ON DAY OF ACCIDENT WITH NO INCIDENTS. PARKED VEHICLE FOR ABOUT 5 HOURS THEN DROVE IT AGAIN FOR ABOUT 1 HALF HOUR THEN PARK. AT 5:00 P.M. LEFT THE OFFICE TO GO HOME. ON THE WAY HOME I MADE TOW STOPS, ONE AT THE POST OFFICE AND ANOTHER AT MY SISTER'S HOUSE. UPON LEAVING MY SISTER'S, I PROCEED TO GO UP HILL. WHEN I GOT TO THE TOP OF THE HILL WITH MY FOOT ON THE BRAKE PEDAL I PROCEEDED TO PUT THE VEHICLE IN LOW GEAR AS I AM ACCOUSTOMED TO WHEN GOING DOWN A HILL WHICH I WAS ABOUT TO DO. AS I PUT THE VEHICLE IN GEAR, IT ACCELERATED TO TOP SPEED GOING DOWN THE HILL. I LOOKED DOWN TO MAKE SURE MY FOOT WAS ON THE BRAKE PEDAL...IT WAS. THE VEHICLE BEGAN RACING DOWN HILL. I APPLIED THE EMERGENCY BRAKES BUT IT DID NOT HOLD. I DECIDED TO TRY TO STEADY THE VEHICLE WITH BOTH HANDS ON THE STEERING WHEEL AS I LOST CONTROL OF THE VEHICLE TO NO AVAIL. I CRASHED INTO A PARKED VEHICLE BOUNCED FROM SIDE TO SIDE THEN HIT A BUMP IN THE ROAD AND BECOME AIRBORNE. THE VEHICLE DROPPED IN A DITCH BOUNCED AGAIN THEN CRASHED INTO A DIRT EMBANKMENT ON THE OTHER SIDE OF THE STREET AT WHICH TIME BOTH THE DRIVER'S AND PASSENGER'S AIRBAGS DEPLOYED. ON JANUARY 6, 2006 I TOOK THE VEHICLE TO THE TOYOTA DEALER HERE ON ISLAND FOR FULL SERVICE. THE FRONT BRAKES WERE CHANGED AS INDICATED ON MY WORK ORDER AND THE BACK BRAKES WERE CLEANED AND ADJUSTED. ON MARCH 6, 2006, I WENT IN TO THE SERVICE DEPARTMENT TO REPORT THE ACCIDENT DESCRIBING WHAT HAPPENED. I WAS TOLD THAT THE BRAKES WERE NOT THE PROBLEM.