Abstract: Method for blocking/braking at least one conical inlet wheel of a drilling-bit of a drilling tool, said method consisting in using at least one toothed wheel (1) of said drilling-bit as an element for driving a hydraulic pump (P) which pumps in a closed circuit (17), said circuit including a controlled distributor (9) in order to take up either an open position or a closed position; such that, in the open position, the pump runs freely without absorbing energy, and that, in the closed position, said pump (P) is hydraulically blocked, which blocks the rotation of the toothed wheel (1).