WHILE ENTERING A PARKING SPACE IN A NORMAL AND FREQUENT MANNER ON THE SIDE OF A WALMART STORE THE VEHICLE FAILED TO RESPOND TO THE BRAKE PEDAL WHEN APPLIED. THE VEHICLE KEPT MOVING AND PROCEEDED OVER THE SIDEWALK AND INTO THE FENCED AREA AROUND THE GARDEN DEPT. BRAKES WERE APPLIED SEVERAL TIMES. NO OTHER VEHICLES INVOLVED AND NO OTHER PERSONS INVOLVED EXCEPT DRIVER (MYSELF), HUSBAND AND SON.