Hydraulic arrangement for controlling front and rear brakes (22; 2a, 2b) of a work vehicle comprising a master brake cylinder module and a source (10; 12) of fluid in pressure, said master brake cylinder module comprising: a right and a left master cylinders (4a,4b), - at least a master cylinder (4a, 4b) is fluidly connected to rear brakes (2a, 2b); - an actuation valve (5a, 5b) for each of said right and left master cylinders (4a, 4b), said actuation valve (5a, 5b) controlling the fluid flow sent from said right and left master cylinders (4a, 4b) to said brakes (2a, 2b) in function of a force exerted on a pedal (9a, 9b); each actuation valve (5a, 5b) comprises a first port (5a', 5b'), a second port (5a ", 5b ") and a third port (5a′′′, 5b′′′), the first port being fluidly connected to said source (10; 12), the second port (5a ", 5b ") being fluidly connected to said actuation valve (5a, 5b) to exert a pressure on said actuation valve (5a, 5b) in addition to the force exerted on said pedal (9a, 9b), the third port (5a′′′, 5b′′′) being fluidly connected to a discharge, each actuation valve (5a, 5b) being configured to pass between a first position into which said first port (5a', 5b') is fluidly connected to said third port (5a′′′, 5b′′′) and said second port (5a ", 5b ") is closed and a second position into which said first port (5a', 5b') is fluidly connected to said second port (5a ", 5b ") and said third port (5a′′′, 5b′′′) is closed, said hydraulic arrangement further comprising an " AND " valve fluidly interposed between said second ports (5a ", 5b ") of said actuation valves (5a, 5b) and said front brakes. - at least a master cylinder (4a, 4b) is fluidly connected to rear brakes (2a, 2b); - an actuation valve (5a, 5b) for each of said right and left master cylinders (4a, 4b), said actuation valve (5a, 5b) controlling the fluid flow sent from said right and left master cylinders (4a, 4b) to said brakes (2a, 2b) in function of a force exerted on a pedal (9a, 9b); each actuation valve (5a, 5b) comprises a first port (5a', 5b'), a second port (5a ", 5b ") and a third port (5a′′′, 5b′′′), the first port being fluidly connected to said source (10; 12), the second port (5a ", 5b ") being fluidly connected to said actuation valve (5a, 5b) to exert a pressure on said actuation valve (5a, 5b) in addition to the force exerted on said pedal (9a, 9b), the third port (5a′′′, 5b′′′) being fluidly connected to a discharge, each actuation valve (5a, 5b) being configured to pass between a first position into which said first port (5a', 5b') is fluidly connected to said third port (5a′′′, 5b′′′) and said second port (5a ", 5b ") is closed and a second position into which said first port (5a', 5b') is fluidly connected to said second port (5a ", 5b ") and said third port (5a′′′, 5b′′′) is closed, said hydraulic arrangement further comprising an " AND " valve fluidly interposed between said second ports (5a ", 5b ") of said actuation valves (5a, 5b) and said front brakes. each actuation valve (5a, 5b) comprises a first port (5a', 5b'), a second port (5a ", 5b ") and a third port (5a′′′, 5b′′′), the first port being fluidly connected to said source (10; 12), the second port (5a ", 5b ") being fluidly connected to said actuation valve (5a, 5b) to exert a pressure on said actuation valve (5a, 5b) in addition to the force exerted on said pedal (9a, 9b), the third port (5a′′′, 5b′′′) being fluidly connected to a discharge, each actuation valve (5a, 5b) being configured to pass between a first position into which said first port (5a', 5b') is fluidly connected to said third port (5a′′′, 5b′′′) and said second port (5a ", 5b ") is closed and a second position into which said first port (5a', 5b') is fluidly connected to said second port (5a ", 5b ") and said third port (5a′′′, 5b′′′) is closed, said hydraulic arrangement further comprising an " AND " valve fluidly interposed between said second ports (5a ", 5b ") of said actuation valves (5a, 5b) and said front brakes.