A hydraulically controlled disk brake including a hydraulically actuated parking brake, which includes: - a brake caliper which includes a housing in which at least one primary hydraulic cavity is formed, which is open axially frontwardly and which is delimited axially rearwardly by a bottom transverse wall of the housing; - a primary piston which is axially slidingly mounted in a sealed manner in the primary hydraulic cavity of the housing in which the primary piston axially delimits a primary hydraulic chamber, the primary piston being capable of cooperating with a disk brake pad associated therewith; - a piston rod which is axially movable with the primary piston and which includes a threaded section; - a wheel, for axially blocking the piston rod, which is screwably mounted on the threaded section of the piston rod in a reversible manner so as to be axially movable in both directions with respect to the piston rod; - a controlled electric motor capable of rotatably driving the blocking wheel; the brake additionally includes a secondary hydraulic cavity, a secondary piston which is axially slidingly mounted in a sealed manner in the secondary hydraulic cavity in which it delimits a secondary hydraulic chamber and which is capable of cooperating with the piston rod to exert on the same a secondary axial thrust strain, from back to front, when the secondary hydraulic chamber is supplied with pressurised fluid; the brake additionally includes an automatic wear compensation assembly, of the screw-nut type: - which is arranged inside the primary hydraulic cavity, axially interposed between the housing and the primary piston; - which includes a compensation screw and a compensation nut which is screwably mounted in a reversible manner on the compensation screw; one of both elements, namely compensation screw or compensation nut, being axially movably linked with the primary piston, and one of both elements being rotatably fixed with respect to the housing; - and which includes a compensation spring which is interposed between the compensation screw and the compensation nut, and which biases both elements, compensation screw or compensation nut, in the direction of increasing the total axial length of the automatic wear compensation assembly; said one of both elements, compensation screw or compensation nut, rotatably fixed with respect to the housing, is rotatably linked with the piston rod; characterized in that: - the brake includes an axial abutment transverse plate which is axially fixed with respect to the housing and which includes an abutment front transverse face, the blocking wheel being axially movable, with respect to the piston rod, between a front position and an abutment rear position in which the blocking wheel is axially rearwardly bearing against said abutment front transverse face; - the piston rod includes a section for rotatably blocking the piston rod which axially extends through a central hole of the abutment transverse plate; - the threading direction of the threaded section of the piston rod is reverse to the threading direction of the wear compensation screw. - a brake caliper which includes a housing in which at least one primary hydraulic cavity is formed, which is open axially frontwardly and which is delimited axially rearwardly by a bottom transverse wall of the housing; - a primary piston which is axially slidingly mounted in a sealed manner in the primary hydraulic cavity of the housing in which the primary piston axially delimits a primary hydraulic chamber, the primary piston being capable of cooperating with a disk brake pad associated therewith; - a piston rod which is axially movable with the primary piston and which includes a threaded section; - a wheel, for axially blocking the piston rod, which is screwably mounted on the threaded section of the piston rod in a reversible manner so as to be axially movable in both directions with respect to the piston rod; - a controlled electric motor capable of rotatably driving the blocking wheel; - which is arranged inside the primary hydraulic cavity, axially interposed between the housing and the primary piston; - which includes a compensation screw and a compensation nut which is screwably mounted in a reversible manner on the compensation screw; one of both elements, namely compensation screw or compensation nut, being axially movably linked with the primary piston, and one of both elements being rotatably fixed with respect to the housing; - and which includes a compensation spring which is interposed between the compensation screw and the compensation nut, and which biases both elements, compensation screw or compensation nut, in the direction of increasing the total axial length of the automatic wear compensation assembly; - the brake includes an axial abutment transverse plate which is axially fixed with respect to the housing and which includes an abutment front transverse face, the blocking wheel being axially movable, with respect to the piston rod, between a front position and an abutment rear position in which the blocking wheel is axially rearwardly bearing against said abutment front transverse face; - the piston rod includes a section for rotatably blocking the piston rod which axially extends through a central hole of the abutment transverse plate; - the threading direction of the threaded section of the piston rod is reverse to the threading direction of the wear compensation screw.