DRY,CLEAR DAY. DRIVING ON A CITY STREET.RED LIGHTWITH BUS IN FRONT OF ME AND A CAR NEXT TO ME. SPEED LIMIT WAS 45MPH. I APPLIED THE BRAKES AND NOTHING HAPPENED.. IT FELT AS THOUGH THE CAR ACCELERATED SLIGHTLY.I TRIED TO APPLY THE EMERGENCY BRAKE AND THE ONE ON THE DASH.AGAIN TO NO EFFECT. I MANAGED TO AVOID THE BUS BY DRIVING ON THE MEDIAN STRIP AND MISSED A LARGE PALM TREE. THE MOTOR STOPPED AND I COASTED ABOUT 150 FEET. THIS IS THE SECOND TIME I HAVE HAD A PROBLEM WITH THE BRAKES. THE FIRST TIME THE BRAKE PEDAL DID NOT MOVE AT ALL AND THE ENGINE ACCELERATED. MANAGED TO AVOID ALL VEHICLES. TOOK THE CAR TO TOYOTA AND WAS TOLD THAT THE PRIUS HAD A LITTLE GLITCH IN ALL OF THEM AND MY CAR IS OK NOW. DID NOT WANT TO CHECK THE COMPUTER OR ANY PART OF MY CAR.OBVIOUSLY, THERE IS A DEFECT IN THE COMPUTER SYSTEM HIT A HEAVY INFORMATION TRAFFIC SIGN ON A STEEL POLE.