WE RENTED A 2013 HYUNDAI SONATA FROM HERTZ ON 8 JUNE 2013. IMMEDIATELY WE NOTED THE BRAKES FELT SPONGY AND TOOK A LONG TIME TO ENGAGE, AS WELL AS THE STEERING DRIFTED RIGHT OR LEFT CONSTANTLY. WE PUT THIS DOWN TO BEING A CHARACTERISTIC OF HYUNDAI, WHICH WE HAD NEVER DRIVEN. WE EXITED THE HIGHWAY. AT THE THIRD STOP/INTERSECTION, THE BRAKES WENT ALL THE WAY TO THE FLOOR BUT FAILED TO ENGAGE. MY FATHER KEPT TRYING THE BRAKES AND THEY FINALLY ENGAGED AFTER ABOUT 3-5 ATTEMPTS. THEN AGAIN, ABOUT TWO STOPS LATER THE BRAKES AGAIN WENT ALL THE WAY TO THE FLOOR AND FAILED TO ENGAGE MULTIPLE TIMES. RATHER THAN REAR END THE VEHICLE IN FRONT OF US AT THE STOPLIGHT, HE MOVED INTO THE RIGHT HAND LANE, WHERE A VEHICLE HIT US AND THEN SPED PAST US. WE TRIED TO COME TO A STOP BEHIND THE VEHICLE TO CALL THE POLICE AND DEAL WITH THE INCIDENT, BUT THE BRAKES STILL WOULD NOT WORK. WE HAD TO SWERVE BACK TO THE LEFT LANE TO AVOID HITTING THE VEHICLE AGAIN, AND FINALLY CAME TO A ROLLING STOP SEVERAL YARDS IN FRONT OF THE VEHICLE. AFTER DEALING WITH THE POLICE, WE TESTED THE BRAKES MULTIPLE TIMES AND THEY WERE ENGAGING, SO WE CONTINUED ON TO MY AUNT'S HOUSE. THE NEXT DAY WE HAD THE VEHICLE TOWED TO A REPAIR SHOP AS WE WERE TOO AFRAID TO DRIVE IT AGAIN, WHERE THEY WERE UNABLE TO REPLICATE THE PROBLEM. IS THERE A PROBLEM WITH THE BRAKING SYSTEM ON THE 2013 HYUNDAI SONATAS? WE'RE JUST VERY THANKFUL THIS DIDN'T HAPPEN WHILE WE WERE ON THE FREEWAY IF WE HAD TO MAKE A SUDDEN STOP, TRAVELING AT