OCTOBER 8, 2019 WAS TAKING OFF IN TRAFFIC AFTER STOPPING AT A RED LIGHT, APPROXIMATELY 5-10 MPH. THE TRAFFIC STOPPED, ATTEMPTED TO APPLY THE BRAKES AND PEDAL FELT HARD. REAR END COLLISION OCCURRED WITH THE CAR IN FRONT OF ME CAUSING REAR DAMAGE TO THAT VEHICLE AND FRONT DAMAGE TO MY VEHICLE. APPROXIMATELY 2 MONTHS LATER WAS PULLING INTO A PARKING SPOT AT A LOW SPEED AND COULD NOT STOP THE VEHICLE, FELT LIKE THE BRAKE PEDAL WAS STUCK TO THE FLOOR. PULLED THE EMERGENCY BRAKE AND WAS ABLE TO GET STOPPED WITHOUT A COLLISION. TOOK VEHICLE INTO DEALER ON JANUARY 10TH. THEY REPROGRAMMED THE HYDRAULIC BRAKE BOOST BUT SAID THE PEDAL WAS STILL HARD AND THEY WOULD NEED TO REPLACE THE MECHANICAL VACUUM OUTPUT. THE PART IS ON BACKORDER BUT THEY WOULD NOT RELEASE THE VEHICLE BACK TO ME BECAUSE OF SAFETY RISKS YET I'VE BEEN DRIVING AROUND FOR MONTHS WITH SAME PROBLEM. ALL RECALLS REVIEWED ARE SUGGESTIVE IF YOU EXPERIENCE THIS PROBLEM NOT A MANDATORY REPAIR. WHY WAIT UNTIL SOMEONE HAS A CRASH LIKE I DID?? ONCE RESEARCHED THIS HAS BEEN A KNOWN ISSUE FOR MONTHS WITH 3 ASSOCIATED RECALLS. THIS IS A HUGE SAFETY ISSUE, NEEDS TO BE MANDATORY REMEDIED. MY VEHICLE DAMAGE WAS SET TO BE REPAIRED NEXT WEEK BUT NOW IT HAS TO BE CANCELLED BECAUSE I DO NOT HAVE THE VEHICLE IN POSSESSION.