Disc brake caliper

A disc brake caliper comprising a caliper body arranged straddling a brake disc having a rotation axis defining an axial direction and opposite friction surfaces, the disc brake caliper comprising pads accommodated in the caliper body so as to slide in the axial direction with respect to the brake disc to act on the opposite friction surfaces, respectively,

• the disc brake caliper comprising:
• a cylinder forming a cylindrical wall and a bottom wall transverse to the cylindrical wall;
• a piston forming a side wall and a thrust wall transverse to the side wall and opposite to the bottom wall of the cylinder;
• wherein the piston is accommodated inside the cylinder, and the side wall of the piston is adapted to slide within the cylindrical wall of the cylinder;
• wherein the piston is configured to be biased by a pressurized brake fluid injectable into the cylinder so as to bias at least one of the pads against one of the opposite friction surfaces of the brake disc, along a thrust direction substantially parallel to the axial direction;
• the disc brake caliper further comprising a parking-braking system which comprises:
• a screw-nut screw group comprising a screw element and a nut screw element wherein the screw element is rotational about a rotation axis substantially parallel to the axial direction and comprises a threaded end housed inside a threaded cavity of the nut screw element and a control end housed inside a rotation seat formed in the bottom wall, wherein a rotation of the screw element corresponds to an axial translation of the nut screw element with respect to the caliper body, the nut screw element being configured to bias the piston, and thus at least one of the pads against one of the opposite friction surfaces of the brake disc;
• and
• a shield element engaged with the nut screw element shaped to be spaced apart from the screw element and extending radially to engage the cylindrical wall, the shield element defining a piston chamber facing the thrust wall and a cylinder chamber facing the bottom wall.