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