Hydraulic braking system for earth-moving vehicles, particularly agricultural tractors and the like

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A hydraulic braking system for earth-moving vehicles, particularly agricultural tractors and the like, comprising two circuits (2) for actuating respective braking units (5, 6, 7) of an earth-moving vehicle that can be actuated by corresponding actuation elements (4), each one of the circuits being provided with a unit for actuating the respective braking unit which comprises a power-assisted braking device (6) that is associated with the corresponding actuation element, with means (12) for supplying liquid at a supply pressure and with a differential master cylinder (7) that comprises a piston (16) provided with a first working surface (17) and with a second working surface (18), which are respectively accommodated within an approach chamber (19) and a braking chamber (20), and is allowed to move in a reciprocating fashion, and with means for connecting the approach chamber (19) to the discharge (29), which comprise hydraulic driving means (30) that are associated with the supply means (12).