made to determine whether the quotient q p dyn gt 1 if this condition is met a dynamic pressure component is calculated in accordance with in the case where this component p v soll drv dyn aktuell represents the maximum of the dynamic pressure component said maximum being calculated during the current brake actuation this value is adopted as a new maximum p v soll drv dyn max function block 116 in function block 117 the maximum thus determined for the dynamic pressure component is assigned to the variable p v soll dyn which represents the signal for the dynamic pressure component which as the output variable of function block 102 is then superimposed by addition on the target booster pressure p v soll drv stat see fig3 when the brake is released i e v ped lt 0 this dynamic pressure component p v soll drv dyn is reduced again to the value 0 for reasons of comfort this reduction in the dynamic pressure target value takes place in accordance with the pedal travel more specifically in such a way that from the reference travel x ped ref determined in block 113 during the brake actuation said travel depending on the maximum pedal travel detected during the braking operation a reduction is carried out in a linear manner with the travel x ped to the value x ped x ped dyn 0 reducing it to zero fig5 illustrates this procedure in the form of a flow diagram blocks 118 122 if it is ascertained in enquiry block 114 that the quotient q p dyn u2266 1 then the brake actuation concerned is one which does not require any further increase in the dynamic pressure component or the brake is being released first of all a.