WHEN BACKING THE VEHICLE TO LEAVE A LOCAL RESTAURANT, DRIVER STRUCK VEHICLE BEHIND HER. THIS HAPPENED SO QUICKLY THAT IT WAS UNKNOWN TO THE DRIVER HOW THE VEHICLE TRAVELED SO QUICKLY THAT DRIVER HAD NOT EVEN HAD A CHANCE TO TURN THE STEERING WHEEL TO AVOID STRIKING THE OTHER VEHICLE. DRIVER PLACED VEHICLE IN DRIVE TO PULL OVER TO ASSESS THE DAMAGE. WHEN PLACED INTO DRIVE, THE VEHICLE LURCHED FORWARD AND CONTINUED TO ACCELERATE DESPITE THE BRAKES BEING APPLIED. THE VEHICLE STRUCK A BRICK RESTAURANT. DAMAGE WAS ALSO DONE TO THE INTERIOR BATHROOM OF THE FACILITY AND THE BUSINESS HAD TO CLOSE TO ASSURE SAFETY OF IT'S STAFF/CUSTOMERS. WITNESS STATES THE VEHICLE WAS OBVIOUSLY LURCHING AND APPEARED TO HAVE A MECHANICAL PROBLEM. THE DRIVER'S FOOT BOUNCED OFF OF THE BRAKE PEDAL ON IMPACT LODGING IT UNDERNEATH THE BRAKE PEDAL. IT WAS ALSO NOTED THAT NEITHER FRONT AIRBAGS DID DEPLOY. DRIVER DID NOT SEEK MEDICAL ATTENTION HOWEVER DRIVER'S FOOT WAS BADLY BRUISED.