ON THREE OCCASIONS IN THE PAST WEEK I LOST ALL ABILITY TO BRAKE. THE PEDAL WOULD GO TO THE FLOOR AND THE ONLY WAY TO STOP THE VEHICLE IS TO ENGAGE THE ELECTRONIC PARKING BRAKE. ON TWO OF THOSE OCCASIONS THE CAR ONLY STOPPED WHEN HITTING A SNOW/ICE BANK. WHEN DEPRESSING THE BRAKE PEDAL, A LOUD AIR PRESSURE RELEASE SOUND WOULD EMIT. HAD VEHICLE TOWED TO DEALER BUT THEY WERE UNABLE TO DUPLICATE THE ISSUE SO NOTHING WAS REPLACED. NOW I HAVE TO DRIVE THE VEHICLE AND HOPE I DON'T CRASH INTO SOMETHING.