Abstract: A pre-engagement for a braking pressure modulator for a pressure regulating circuit of an electronic braking system of a vehicle includes a first pneumatic inlet through which a supply pressure is supplied to the pre-engagement unit, a second pneumatic inlet through which a redundancy pressure is supplied to the pre-engagement unit, a first pneumatic output terminal through which the pre-engagement unit is connected to an air quantity augmenting relay valve, and a second pneumatic output terminal through which the pre-engagement unit is connected to a pressure sink. The pre-engagement unit also includes an electrically actuated valve system having a plurality of solenoid valves, including a plurality of interconnected pneumatic terminals, and a plurality of electrical terminals which are connected to output terminals of an electronic control unit. An electric braking command signal transmitter delivers a driver initiated electric brake value setting to an input of the electronic control unit.