An operating mechanism for a parking brake includes a manual brake lever pivotably coupled to a bearing block and a locking device adapted to lock the manual brake lever into a position. The locking device includes a detent arranged on the manual brake lever and adapted to pivot around a pivoting axis, the detent having a bore, a locking segment connected to the bearing block, a spring element adapted to hold the detent into a locking position on the locking segment, and a connecting element adapted to secure the detent on the manual brake lever. The connecting element and the spring element jointly form a single structural unit adapted for insertion into the bore in the detent during installation of the detent on the manual brake lever.