Brake system for a vehicle

A brake system for a vehicle, comprising:

• a brake piston connectable to a brake pad and configured for performing a braking motion to press the brake pad against a friction surface, wherein the braking motion is actuatable by hydraulic actuation,
• an electro-mechanical parking brake actuator configured for actuating the braking motion of the brake piston,
• the electro-mechanical parking brake actuator comprising:
• a spindle, which is rotatable by an electric motor,
• and a nut received on the spindle such that a rotational motion of the spindle leads to a translational motion of the nut,
• wherein the nut is coupled with the brake piston such that a translational motion of the nut toward the brake piston actuates the braking motion of the brake piston,
• wherein the brake system further comprises an elastic member coupling the brake piston with the nut, wherein the elastic member is configured to drive a motion of the brake piston in a direction opposite the direction of the braking motion of the brake piston,
• wherein the elastic member is configured to decouple the nut from the brake piston upon retraction of the nut beyond a decoupling point,
• wherein the elastic member is held within a groove with a bottom surface and contacts an inclined inner surface of the brake piston,
• wherein the inclined inner surface of the brake piston is tapered such that it has a wider inner diameter on the side facing the brake pad,
• wherein the decoupling point is formed by an edge projecting inwards from the inner circumferential surface of the brake piston,
• wherein the nut comprises a rotation prevention member formed by a ridge of the nut,
• wherein the rotation prevention member is arranged further from the brake pad than the elastic member, and
• wherein the rotation prevention member is arranged further from the brake pad than the edge of the brake piston when the nut is coupled to the brake piston.