An operating mechanism for a parking brake includes a manual brake lever pivotably coupled to a bearing block, a locking device adapted to secure the manual brake lever in a predetermined pivoting position, an actuating rod guided inside the manual brake lever and operatively connected to the locking device, and a guiding device for the actuating rod located on the manual brake lever. The guiding device comprises a U-shaped profile having an opening oriented toward a side of the manual brake lever. The opening is adapted to receive the actuating rod.