A secondary braking device for a self-propelled diesel-driven roller is especially for a vibrating roller that is operated on steep downgrades only on rare occasion. A connecting element is arranged at the neck part so as to receive an inlet end of a dispensing line. The method may further include performing an in-line optical inspection of the analog integrated circuit to obtain physical defect data, and correlating the electrical failure data and physical defect data to analyze critical defects. Each spraying period is followed by a quiescent period to allow the bed to reform.