The invention relates to a brake mechanism for a forest cultivator, said forest cultivator comprising disc wheels (1, 1'), mounted on either side of a body (3) and fitted with cultivating tools (2), and said brake mechanism comprising at least one contact element (7) fastened to each disc wheel (1, 1'), a release element (6) fastened to a body (11) as well as a clamping element (8) for preventing rotation of disc wheel (1, 1'), said release element (6) being adapted through the action of contact element (7) to push towards a clamped disc wheel (1') and to effect the clamping of a rotating disc wheel (1) and the release of a clamped disc wheel (1'). The release element comprises a control rod (6) common to both disc wheels (1, 1') and the clamping element comprises a locking rod (8) common to both disc wheels (1, 1'), said movement of control rod (6) being adapted to be transmitted into a movement in the direction opposite to that of locking rod (8) for releasing a clamped disc wheel (1'). Fig. 2
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