This patent application refers to a device able to regulate the braking force in mechanical or hydraulic braking systems, preferably bicycles. In the case of hydraulic braking systems, the goal is to reduce the pressure of the hydraulic circuit fluid. In the case of mechanical braking systems, the goal is to reduce the cable tension, in a Bowden cable force transmission system.In particular, in both cases the goal is to drastically reduce the braking force, when an activation command based on measures provided by sensors is sent by the electronic control unit to the actuator, in a limited time, with a low power consumption and low mechanical stress to the involved components, with a system safety and reliability oriented. The braking force regulation is executed by a mechanical actuation system with activation on demand of a control unit exploiting signals of sensors. Said mechanical actuation system is composed of a mechanical linkage, characterized by two states, "passive" and "active", able to superimpose its action to the human action on the brake lever, and of an activation mechanism that, when activated, allows the transition of the mechanical linkage from the passive to the active configuration, fostered by the forces present in the system. Before and after the activation, the device leaves the braking system where it is inserted functionally equivalent to a system without the device. The braking capability of the system is preserved also in case of partial breakage of the actuator itself, or in case of undesired activation. The device is equipped with a reset system to the passive configuration, tailored to enabling another intervention to regulate the braking force.
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