A walking foot is not needed for piecing, a walking foot is used when sewing 3 pieces(Backing, batting and top together) I recommend using a 1/4 inch foot while paying special attention when nearing the end of the seam, some machines have a tendency to veer left. Maybe need to loosen the pressure foot tension that feeds the top fabric. Not familiar with the Brother 1500 not sure if it has the ability to adjust foot tensions. My Pfaff does not.