Electronically slip-controllable power-assisted braking system, in particular for a motor vehicle

An electronically slip-controllable power-assisted braking system for a motor vehicle, comprising:

• an actuation device capable of being impinged upon by muscle force and a booster device interacting with the actuation device for generation of a circuit pressure in at least one brake circuit connected to the actuation device;
• a pressure modulation device capable of having control applied electronically to it and provided in the brake circuit, for converting the circuit pressure into a brake pressure as a function of slip conditions existing at a wheel of a vehicle equipped with the power-assisted braking system;
• and
• at least one wheel brake connected to the brake circuit, the at least one wheel brake being associated with the wheel of the vehicle and converting the brake pressure into a wheel braking force;
• the booster device inserted into the brake circuit downstream from the actuation device, and having a piston unit guided movably in an interior space of a cylinder housing, which divides the interior space into booster chambers sealed with respect to one another, at least one first one of the booster chambers being impinged upon, from a pump drivable by external power, by pressure medium under pump pressure.