DESCRIZIONE
The invention relates to a brake unit (3) for a catching device (2) of elevator systems (1) having a rolling element (28) on a rolling disk (27), which rolling element rolls on a stationary rolling track (20) of a braking and guiding rail (7) at least in some sections in the event of an activation. Furthermore, a brake lining (24, 26) is preferably provided, which interacts with a stationary braking track (21, 22) on the rail (7) as a result of the rolling of the rolling element (28) on the rolling track (20). In addition, at least one marking element (40, 41, 66) is provided, which produces a start marking (47) and an end marking (48) on the rolling track (20) and/or the braking track (21, 22) when the rolling element (28) rolls on the rolling track (20). Then the braking distance of the elevator cab (6) can be determined from the distance (49) between the start marking (47) and the end marking (48).