Brake pistons leaking oil

After the brake caliper repair the pistons/cilinders started to leak brake fluid. Seems that cleaning the pistons with brush took off the rust part and left enough space to leak oil. Here is an image that made it clear: http://www.turbocelica.lv/images/2009-03-27-brake-piston-caution

Seems I have to order new pistons and rebuild the brakes again..