Patent ID: 8851241

Claim:
A hydraulically actuated disc brake, comprising: a brake housing; a brake piston arranged in the brake housing, the brake piston acting upon a brake pad in use; a parking brake device operatively coupled with the brake piston; and a restoring piston operatively arranged in a head of the brake piston, said head of the brake piston facing toward the brake pad in use, wherein the brake piston includes a depression formed in a brake piston head facing toward the brake pad in use, the parking brake device comprises an actuating lever rotationally fixedly connected to an actuating eccentric for releasing a parking braking action, a pressure piston, which interacts with the actuating eccentric, a rotationally fixed adjusting screw on which the pressure piston acts, and an adjusting nut, which is arranged on a non-self-locking thread of the adjusting screw, the adjusting nut has at one end a friction cone which interacts with a corresponding friction cone in the brake piston and forms a friction coupling, the friction cone of the adjusting nut has, on an underside facing toward the brake pad in use, an end surface on which an axial anti-friction bearing is arranged around the restoring piston at a location closer to a brake pad-end of the adjusting nut than an adjusting nut-contact surface of the restoring piston, and the restoring piston includes a receptacle to receive the adjusting screw.