A servo system for controlling the position Y(s) of an actuator to a position setpoint R(s) in a motor vehicle, the actuator having a predetermined transfer function G(s) associated with a pure delay e -ds, s being the Laplace variable, d representing the pure delay, this system being realized via - a position control U(s) at input of the transfer function G(s), the position Y(s) of the actuator corresponding to the response of the actuator to the position control U(s); - the position control U(s) being developed with the aid of a regulator of the Proportional Derivative type, formed of a proportional action loop and a derived action loop, realized respectively by a first and a second loop (32, 33) of retroaction between the position Y(s) and subtracting inputs of a first adder, the regulator realizing a third loop of retroaction between position Y(s) and a subtracting input of a second adder, the second adder having as summing input the position setpoint R(s); - the position setpoint R(s) being also used as input of an amplifying loop, the output of which is connected to a summing input of the first adder; - the output of the second adder being used as an input of an integral action loop, the output of which is connected to a summing input of the first adder so that the first adder calculates at its output the position U(s) as a function of its summing and subtracting inputs; this system being characterized in that it includes a pure delay compensator in which - the position control U(s) is used as first summing input of a third adder and as input of a pure delay block of transfer function e -ds, the output of this pure delay block being used as subtracting input of the third adder, so that the third adder calculates its output from its summing input and its subtracting input: - the input of a high-pass filter is connected to the output of the third adder; - the input of an amplifier is connected to the output of the high-pass filter; - the output of the amplifier corresponds to a delay compensation term P(s), this output being used as subtracting input by the second adder. - a position control U(s) at input of the transfer function G(s), the position Y(s) of the actuator corresponding to the response of the actuator to the position control U(s); - the position control U(s) being developed with the aid of a regulator of the Proportional Derivative type, formed of a proportional action loop and a derived action loop, realized respectively by a first and a second loop (32, 33) of retroaction between the position Y(s) and subtracting inputs of a first adder, the regulator realizing a third loop of retroaction between position Y(s) and a subtracting input of a second adder, the second adder having as summing input the position setpoint R(s); - the position setpoint R(s) being also used as input of an amplifying loop, the output of which is connected to a summing input of the first adder; - the output of the second adder being used as an input of an integral action loop, the output of which is connected to a summing input of the first adder so that the first adder calculates at its output the position U(s) as a function of its summing and subtracting inputs; - the position control U(s) is used as first summing input of a third adder and as input of a pure delay block of transfer function e -ds, the output of this pure delay block being used as subtracting input of the third adder, so that the third adder calculates its output from its summing input and its subtracting input: - the input of a high-pass filter is connected to the output of the third adder; - the input of an amplifier is connected to the output of the high-pass filter; - the output of the amplifier corresponds to a delay compensation term P(s), this output being used as subtracting input by the second adder.