Wear - adjusting device for a disc brake, which is a brake application device having a relative to a brake caliper (1) and (5) and at least one with the crosspiece (5) coupled to the adjusting spindle (10, 10a), which during the braking of a brake pad (13, 13a) in the direction of the brake disk presses, wherein the wear - adjusting device is an adjusting spindle - rotational drive for rotating the adjusting spindle (10) relative to the traverse (5) which has a drive element (15) and a cooperating therewith, about the axis of rotation (22) of the adjusting spindle (10) and rotatable with the adjusting spindle (10) in at least one direction of rotation which is coupled to the rotary output element (20), characterised in that the drive element (15) of the adjusting spindle - rotational drive to the crossmember (5) and coupled by the crossmember (5) is displaceable, the drive element (15) with the output element (20) which cooperates in such a way that the sliding movement of the drive element (15) a rotary movement of the drive member (20) generates.
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