SOMETHING STARTED BUZZING EVERY FEW SECONDS IN ENGINE COMPARTMENT TOWARD DRIVERS SIDE FIREWALL. AT SLOW SPEEDS, BRAKES PULSATED WITH UNEVEN BRAKING. AS TIME WENT ON, BUZZING WAS MORE FREQUENT. WARNING LIGHTS FLASHED ONCE BUT WENT OUT. AFTER THAT, WHEN PARKING CAR, THE BRAKES WENT ALL THE WAY TO THE FLOOR AND I HIT ANOTHER CAR AT PARKING SPEEDS. DEALER SAYS 'BRAKE ACTUATOR PUMP' AND WILL COST NEARLY $3000 TO FIX. THIS PUMP ALSO WENT OUT ON MY 2005 PRIUS! BUT THAT WAS COVERED BY A 'HIDDEN' WARRANTY THAT I FOUND WHILE GOOGLING THE ISSUE. WOULD HAVE PAID FULL PRICE FOR THAT REPAIR IF I HAD NOT RUN ACROSS THAT TSB. THIS IS OBVIOUSLY A BIG MONEY MAKER FOR TOYOTA FIXING THESE BUT IS A HUGE DANGER TO THE MANY DRIVERS THIS HAS HAPPENED TO OVER THE YEARS. PLEASE DO SOMETHING ABOUT IT BEFORE SOMEONE GETS HURT. IT IS A RECURRING AND SUBSTANTIAL THREAT TO DRIVER SAFETY THAT MANY DRIVERS WILL OVERLOOK BECAUSE OF THE INFLATED COST OF THE PARTS. THANK YOU.