A disc brake system for a wheel of a motor vehicle, comprising: - a brake disc, rotary movable around a disc axis ( X W), intended to be rotary connected with said wheel, and - a brake mechanism, comprising:. at least one brake pad having a central pad axis ( X P) that is parallel to the disc axis ( X W) and that defines a first direction according to which the brake pad can move between a first position away from the brake disc, and a second position in contact with the brake disc,. a cylinder, in particular a pneumatic cylinder, having a rod movable in a second direction,. a lever, rotary movable around a lever axis ( X L), the lever having a lever end connected to said rod such that the lever is driven in rotation around the lever axis ( X L) when the rod is moved in the second direction,. a cam element, arranged to convert a rotary motion of the lever around the lever axis ( X L), into a translation motion in the first direction,. at least one piston, expanding between a first end connected to the brake pad and a second end connected to the cam element, so as to transmit a translation motion in the first direction from the cam element to the brake pad, and. a housing, at least for the lever, the cam element and the piston, wherein considering a plane comprising the disc axis ( X W) and the central pad axis ( X P), the lever axis ( X L) is inclined relative to said plane, at an angle different from 90°, characterized in that the lever is inclined at an angle (β) between 0 and 45° with respect to a direction that is perpendicular to the lever axis ( X L). - a brake disc, rotary movable around a disc axis ( X W), intended to be rotary connected with said wheel, and - a brake mechanism, comprising:. at least one brake pad having a central pad axis ( X P) that is parallel to the disc axis ( X W) and that defines a first direction according to which the brake pad can move between a first position away from the brake disc, and a second position in contact with the brake disc,. a cylinder, in particular a pneumatic cylinder, having a rod movable in a second direction,. a lever, rotary movable around a lever axis ( X L), the lever having a lever end connected to said rod such that the lever is driven in rotation around the lever axis ( X L) when the rod is moved in the second direction,. a cam element, arranged to convert a rotary motion of the lever around the lever axis ( X L), into a translation motion in the first direction,. at least one piston, expanding between a first end connected to the brake pad and a second end connected to the cam element, so as to transmit a translation motion in the first direction from the cam element to the brake pad, and. a housing, at least for the lever, the cam element and the piston, wherein considering a plane comprising the disc axis ( X W) and the central pad axis ( X P), the lever axis ( X L) is inclined relative to said plane, at an angle different from 90°, characterized in that the lever is inclined at an angle (β) between 0 and 45° with respect to a direction that is perpendicular to the lever axis ( X L).. at least one brake pad having a central pad axis ( X P) that is parallel to the disc axis ( X W) and that defines a first direction according to which the brake pad can move between a first position away from the brake disc, and a second position in contact with the brake disc,. a cylinder, in particular a pneumatic cylinder, having a rod movable in a second direction,. a lever, rotary movable around a lever axis ( X L), the lever having a lever end connected to said rod such that the lever is driven in rotation around the lever axis ( X L) when the rod is moved in the second direction,. a cam element, arranged to convert a rotary motion of the lever around the lever axis ( X L), into a translation motion in the first direction,. at least one piston, expanding between a first end connected to the brake pad and a second end connected to the cam element, so as to transmit a translation motion in the first direction from the cam element to the brake pad, and. a housing, at least for the lever, the cam element and the piston, wherein considering a plane comprising the disc axis ( X W) and the central pad axis ( X P), the lever axis ( X L) is inclined relative to said plane, at an angle different from 90°, characterized in that the lever is inclined at an angle (β) between 0 and 45° with respect to a direction that is perpendicular to the lever axis ( X L).