Brake system for a vehicle comprising: a brake pedal valve and at least one brake valve unit for actuating a brake actuator (22, 24) having: a brake valve for applying pressurized fluid to the brake actuator (22, 24) in response to a control pressure applied to a hydraulic actuator of the brake valve, a blocking valve for controlling application of pressurized fluid from the brake pedal valve to the hydraulic actuator of the brake valve, and a brake pressure control valve for controlling application of pressurized fluid to the hydraulic actuator of the brake valve, characterized in that the brake system comprises a control unit configured to operate the brake system in an automatic retarding control mode and in a brake assist mode; and wherein the blocking valve is biased towards an open position; and wherein the at least one brake valve unit further comprises a shuttle valve including an output port fluid-communicatively connected to the hydraulic actuator, a first input port fluid-communicatively connected to the blocking valve, and a second input port fluid-communicatively connected to the brake pressure control valve, wherein in the automatic retarding control mode, the control unit is configured to actuate the brake pressure control valve so as to apply pressurized fluid to the second input port, while the blocking valve is biased in its open position such that the brake pedal valve is fluid-communicatively connected to the first input port. a brake pedal valve and at least one brake valve unit for actuating a brake actuator (22, 24) having: a brake valve for applying pressurized fluid to the brake actuator (22, 24) in response to a control pressure applied to a hydraulic actuator of the brake valve, a blocking valve for controlling application of pressurized fluid from the brake pedal valve to the hydraulic actuator of the brake valve, and a brake pressure control valve for controlling application of pressurized fluid to the hydraulic actuator of the brake valve, characterized in that a brake valve for applying pressurized fluid to the brake actuator (22, 24) in response to a control pressure applied to a hydraulic actuator of the brake valve, a blocking valve for controlling application of pressurized fluid from the brake pedal valve to the hydraulic actuator of the brake valve, and a brake pressure control valve for controlling application of pressurized fluid to the hydraulic actuator of the brake valve, characterized in that the brake system comprises a control unit configured to operate the brake system in an automatic retarding control mode and in a brake assist mode; and wherein the blocking valve is biased towards an open position; and wherein the at least one brake valve unit further comprises a shuttle valve including an output port fluid-communicatively connected to the hydraulic actuator, a first input port fluid-communicatively connected to the blocking valve, and a second input port fluid-communicatively connected to the brake pressure control valve, wherein in the automatic retarding control mode, the control unit is configured to actuate the brake pressure control valve so as to apply pressurized fluid to the second input port, while the blocking valve is biased in its open position such that the brake pedal valve is fluid-communicatively connected to the first input port.