A readjusting device is provided for compensating wear of a brake pad or multiple brake pads and/or a brake disc of a pneumatically actuatable disc brake for a vehicle. The readjusting device has a mechanical actuator, and the mechanical actuator converts a rotational movement of a brake lever into a rotational movement of a shaft. The shaft rotates at least one threaded spindle which acts on one of the brake pads. The readjusting device can carry out an advancing movement and a return movement of the threaded spindle, and the advancing movement and the return movement of the threaded spindle can be terminated by switching one or more couplings.