A crown brake device for motor-vehicles, comprising - a crown element intended to be connected in rotation with a motor-vehicle wheel hub, - wherein the crown element has a cup-shaped body with a main axis, - wherein said cup-shaped body includes a peripheral cylindrical wall having an outer cylindrical surface and an inner cylindrical surface, - a brake caliper that can be activated to pull an outer friction pad and to push an inner friction pad along an axis directed radially with respect to the axis of the crown element, to cause braking of the rotation of the crown element, - wherein said brake caliper has a body including a hydraulic cylinder, having an axis substantially coincident with said radial axis, with a hydraulic chamber and a piston slidably mounted in the cylinder, and configured to radially press the inner friction pad against said inner cylindrical surface when the hydraulic chamber receives pressurized fluid, the body of the brake caliper being also configured, in this condition, to radially press the outer friction pad against said outer cylindrical surface, wherein the body of the brake caliper is slidably supported on at least two cylindrical guide pins arranged parallel to said radial axis, and wherein said cylindrical guide pins project in a cantilever manner from a support of the brake caliper, wherein the body of the brake caliper has a general C-shaped configuration, with an outer flange arranged radially outwards of the cylindrical wall of the crown element, an inner portion constituting said hydraulic cylinder, arranged radially inside the cylindrical wall of the crown element and an intermediate portion facing the circumferential end edge of said cylindrical wall of the crown element, and provided with two bushing-shaped portions, which are slidably mounted over said cylindrical guide pins, said brake device being characterized in that it comprises an outer pad-carrying plate and an inner pad-carrying plate, each of said pad-carrying plates (21A, 21B) being rigidly connected to an auxiliary plate (22A, 22B) perpendicular thereto, each auxiliary plate (22A, 22B) on its turn being connected to one or more support rods directed parallel to the axis of the crown element and engaged through openings passing through said intermediate portion of the body of the crown element, each support rod being recalled by a spring towards an end position wherein the respective pad-carrying plate (21A, 21B) is pushed laterally into engagement against said intermediate portion of the body of the brake caliper. - a crown element intended to be connected in rotation with a motor-vehicle wheel hub, - wherein the crown element has a cup-shaped body with a main axis, - wherein said cup-shaped body includes a peripheral cylindrical wall having an outer cylindrical surface and an inner cylindrical surface, - a brake caliper that can be activated to pull an outer friction pad and to push an inner friction pad along an axis directed radially with respect to the axis of the crown element, to cause braking of the rotation of the crown element, - wherein said brake caliper has a body including a hydraulic cylinder, having an axis substantially coincident with said radial axis, with a hydraulic chamber and a piston slidably mounted in the cylinder, and configured to radially press the inner friction pad against said inner cylindrical surface when the hydraulic chamber receives pressurized fluid, the body of the brake caliper being also configured, in this condition, to radially press the outer friction pad against said outer cylindrical surface,