WHEN PARKING '07 NISSAN FRONTIER INTO A PARKING STALL, I PRESSED ON THE BRAKE PEDAL TO COME TO A FULL STOP. THE ENGINE THEN STARTED TO RACE AND MOVE THE TRUCK FORWARD. I ALREADY HAD THE BRAKE PEDAL DOWN TO THE FLOOR WITH NO RESPONSE, THE TRUCK CLIMB THE PARKING CURB AND HIT A SITGN AND THEN A PARKED CAR. COULDN'T BELIEVE THAT NOTHING COULD STOP THE TRUCK TILL IT HIT THE CAR AND THEN THE ENGINE STOPPED RACING. I HAD THE INSURANCE ADJUSTER TAKE ALOOK AT THE TRUCK AND MADE HIM PRESS THE BRAKES WHERE IT WENT DOWN TO THE FLOOR. HE THEN HAD A TOWING COMPANY TOW THE TRUCK DOWN TO THE DEALERSHIP TO PREVENT ANOTHER ACCIDENT. DEALER HAD THE TRUCK FOR A WEEK BUT COULD NOT FIND ANYTHING WRONG WITH THE TRUCK. THEY NOTED THAT THE BRAKE PEDAL WAS SOFT BUT IT SHOULD BE OKAY. THEY COULD NOT GET THE MOTOR TO RACE SO THEY COULD NOT DO ANYTHING. THEY DID ALL THE TEST THAT THEY COULD BUT INFORMED ME THAT THEY CAN'T FIX SOMETHING THEY CANNOT FIND.