Brake Caliper Slider Pins. Caliper Rebuild / Repair Kits. Caliper Repair / Service Kits. Brake Caliper Pistons. - 2x Budweg caliper pistons. - 2x Siensa Autofren caliper repair kits. These are Budweg / Siensa Autofren premium quality caliper rebuild kits with parts for two brake calipers.