SOMETIME IN OCT. WHILE PULLING OFF OF I-74 ONTO 53RD ST. IN DAVENPORT, IA, WAS THE FIRST TIME THAT WHEN THE BRAKE WAS APPLIED THE CAR SPED UP RATHER THAN SLOWED DOWN. THIS HAPPENED AGAIN TOWARDS THE END OF NOVEMBER WHILE TRAVERSING FROM US-6 ONTO I-80 IN GENESEO. BOTH TIMES I HAD BEEN USING THE CRUSE CONTROL, DISENGAGED IT BY APPLYING THE BRAKE AND AS THE CAR SLOWED DOWN REAPPLICATION OF THE BRAKE CAUSED THE CAR TO SPEED UP. BY TAKING MY FOOT OFF THE BRAKE AND THEN REAPPLYING THE BRAKE CAR SLOWED NORMALLY ABOUT THE MIDDLE OF DECEMBER I HAD A MORE SERIOUS INCIDENT WHILE PULLING INTO A CONVIENCE STORE OFF OF WOLF ROAD IN GENESEO. I DIENGAGED THE CRUSE AND PULLED INTO A PARKING PLACE. THE CAR SLOWED NORMALLY AND WAS ALMOST TO A STOP WHEN IT BEGAN TO ACCELERATE WHILE THE BRAKE WAS APPLIED. I TURNED THE CAR TO THE RIGHT, AND JUST MISSED THE BUILDING, BUT TOOK OUT A 4X4 SUPPORT FOR THE ROOF OVERHANG. DAMAGE WAS LIMITED TO DENTS ON THE CAR AND THE 4X4. NO PERSONAL INJURIES WERE INVOLVED. AFTER THE FIRST OCCURANCE I THOUGHT IT WAS MY MISTAKE, I APPLIED THE ACCELERATOR WHEN I MEANT TO APPLY THE BRAKE. THE SECOND TIME I FELT IT WAS PROBABLY A PROBLEM WITH THE CAR, AND WOULD BRING IT UP WITH TOYOTA NEXT TIME I BROUGHT THE CAR IN. THE THIRD TIME I WAS SURE THAT IT WAS A PROBLEM FOR TOYOTA AND I TOOK THE CAR INTO THE TOYOTA DEALER. THEY COULD NOT DUPLICATE THE PROBLEM AND SAID NEITHER THEY OR THE DISTRICT OFFICE HAD HEARD OF A SIMILAR PROBLEM BEFORE. WE THEN CONTACTED THE TOYO