ON AUGUST 25, 2010, I WAS TAKING MY GRANDCHILDREN TO RAINBOW STATION DAYCARE IN OUR TOYOTA SPORTS VAN SIENNA XLE, 1998. WARRENTON TOYOTA DEALER IN VIRGINIA PERFORMED A FULL 100,000-MILE SERVICE ON VAN ON JULY 10, 2010. I TURNED INTO THE PARKING LOT OF THE DAY CARE AT A SPEED OF 5 MPH WITH MY FOOT ON THE BRAKE. WHILE I WAS ABOUT TO PARK THE CAR, THERE WAS UNINTENDED SUDDEN ACCELERATION OF THE CAR AND CAR WENT FROM PARKING LOT TO SIDEWALK AND BEGAN GOING TOWARDS THE OFFICE OF THE DAYCARE. I TURNED THE STEERING TO THE RIGHT AS FAR AS I COULD IN ORDER TO GET AWAY FROM THE ENTRANCE OF THE DAYCARE AND THE LOBBY (BOTH HAVE A GLASS WALL) AND WAS TRYING TO GET BACK TO THE PARKING LOT THE CAR WOULD NOT STOP. I TRIED TO PUSH THE BRAKE AS HARD AS I COULD BUT THE CAR WOULD NOT STOP INSTEAD IT LEFT CAR TIRE TRACK MARKS ON THE SIDEWALK AND THE FRONT LAWN OF THE DAYCARE. THE CAR FINALLY HIT THE BRICK WALL AND STOPPED. FORTUNATELY THE GRANDCHILDREN WERE SAFE. MY RIGHT HAND WRIST BONE (RADIUS) WAS BROKEN. I HAD TO UNDERGO SURGERY. OUR CAR WAS TOTALED AND IS BEYOND REPAIR. TOYOTA IS TRYING TO FIND OUT HE CAUSE OF ACCIDENT. *TR