An operating mechanism for a parking brake. The operating mechanism includes a manual brake lever pivotably coupled to a bearing block by a tubular holder. The manual brake lever is fixed to the tubular holder. The mechanism also includes a locking device adapted to fix the manual brake lever in a predetermined pivoting position, an activation rod guided inside the manual brake lever and operatively connected to the locking device, and a transfer element connected to the tubular holder. The transfer element is adapted to transmit movement of the manual lever to the parking brake.