Disc brake caliper, method for manufacturing a caliper and caliper spring

A lost core for a caliper body, comprising:

• a core body to create the caliper body including a pair of pads having friction material adapted to be supported by the caliper body;
• first and second intermediate chamber cores comprising a proximal piston chamber core and a distal piston chamber core, wherein the intermediate chamber cores project axially from both first and second sides of the core body to create on each side of a proximal piston chamber and a distal piston chamber for the caliper body, wherein said first and second intermediate chamber cores are the only intermediate chamber cores;
• and
• a proximal branch core that protrudes from the proximal piston chamber core and extends towards the distal piston chamber core and a distal branch core that protrudes from the distal piston chamber core and extends towards the proximal piston chamber core;
• wherein the proximal branch core and the distal branch core terminate with a respective free end separated from each other;
• wherein centers of said cores are arranged at vertices of an imaginary rhombus for which a minor diagonal is disposed radially and a major diagonal is disposed laterally,
• wherein said vertices fall within peripheral contours of each pad of the pair of pads;
• wherein vertices are arranged so that said major diagonal extends between two side chamber cores without intersecting with said immediate chamber cores.