A clutch or brake with an electrically actuated switching coil and an armature that axially moves toward the switching coil and forms a connection with the switching coil and can rotate relative to the switching coil, in an adjustment system for camshafts of a combustion engine. A superposition transmission has an input driven by a crankshaft of the engine, a drive output element that drives a camshaft of the engine and a control element, by which relative rotation between the input and the output can be produced by applying a braking torque. The armature is rotationally fixed and axially slidable, and centered on or at a transmission component, and the switching coil is rotationally fixed and centered coaxially with the armature by a membrane spring on a further transmission component, relative to which the armature is braked or to which the armature is coupled.