In a screwing element for accommodation of a fastener head of a fastener there are provided jaws for seizing the fastener head. The valves of the invention include check valves such as diaphragm valves and flap valves. For operation of the brake system having traction control, pressure quantities which describe the brake pressure established for the respective vehicle wheel are analyzed. The slider assembly includes a slider body configured to be received within the track channel. Changes in blood oxygen saturation can be monitored with this method for early detection of disease.