SEPT. 2ND, 2016, MY 26-YR-OLD DAUGHTER (AN EXPERIENCED DRIVER) LEFT WORK, APPROACHED A "T" COUNTRY ROAD INTERSECTION AT MODERATE SPEED, ON A SOMEWHAT ROUGH ROAD, AND APPLIED BRAKES TO SLOW DOWN. NOTHING HAPPENED - THE CAR DID NOT SLOW. THE CAR DROVE ACROSS THE INTERSECTION INTO A FARMYARD. SHE PULLED THE EMERGENCY BRAKE, BUT IT DID NOT STOP THE CAR. IT SKIDDED, BUT SHE WAS ABLE TO STEER AROUND A WOOD PILE AND AVOID TREES. CAR STOPPED WHEN IT CRASHED INTO A DIRT MOUND. THIS WAS TOTAL BRAKE FAILURE. BUMPER WAS RUINED, AND THERE IS DAMAGE IN ENGINE COMPARTMENT. NO FIRE OR INJURIES. NO AIR BAG DEPLOYMENT. CAR WAS TOWED TO DEALERSHIP, WHO NEXT DAY DROVE CAR AROUND DEALERSHIP LOT AND FOUND NO BRAKE PROBLEM. CRASH DAMAGE MADE CAR NOT ROAD-WORTHY TO TEST BRAKES AT HIGHER SPEED. CAR HAS ABOUT 42,200 MILES ON IT. BACK IN MID-SUMMER, THE DEALER HAD REPAIRED A PROBLEM THAT APPARENTLY WAS BRAKE STOPPER RECALL-RELATED (A LATE-AUGUST RECALL). WE REPORTED THE FAILURE AND CRASH TO HYUNDAI AMERICA.