Disc brake caliper with reduced axial dimension

A disc brake caliper, comprising a caliper body having a pair of half-calipers which define a housing compartment for a portion of an associable brake disc, said half-calipers being placed on opposite sides to the housing compartment in an axial direction parallel to the rotation axis of the associable brake disc, at least one half-caliper being fitted with at least one housing seat for a piston suitable to press a pad against the associable brake disc, in the axial direction,

• wherein the caliper is fitted with a hydraulic supply circuit of hydraulic fluid for the operation of said at least one piston, said hydraulic circuit comprising at least one supply duct which crosses a half-caliper at least partially,
• characterised in that
• the housing seat passes through the respective half-caliper so as to extend between an inner wall facing the housing compartment and an outer wall of the half-caliper, axially opposite said housing compartment,
• wherein a cup-shaped hollow insert is housed inside the housing seat so as to present a closed end wall, placed on the side of the outer wall of the half-caliper, and a cavity having an aperture facing axially towards the housing compartment,
• wherein at least one piston is housed inside the cavity of the insert and is guided axially by an inner side wall of the insert,
• wherein the supply duct intercepts a supply seat made between the insert and the housing seat, said supply seat being fluidically connected to the piston so as to be able to operate it under the thrust of the fluid;
• wherein the at least one piston has a piston head that extends axially beyond the insert and the half-caliper inner wall to abut the associable brake pad, the piston head having a radially outward circumferential recess;
• wherein a first end of a sealing sleeve is located in said piston head recess and a ring shaped attachment hook is located in a second end of the sealing sleeve to engage the half-caliper inner wall;
• and
• wherein a plurality of bellow folds are between the first end and the second end of the sealing sleeve and between the insert and the associable brake pad.