Hydraulic motor vehicle braking system with wheel slip controller

A hydraulic motor vehicle brake system with wheel slip controller, comprising:

• a brake pressure applicator, including a pedal-activated vacuum brake booster and a main brake cylinder wherein said brake pressure applicator is connected by way of a brake line to at least one pair of wheel brakes,
• a pump connected to the brake line for conveying pressure agent from the brake pressure applicator in the direction of the wheel brakes during wheel slip control,
• at least one pressure modulation valve installed in the brake line to vary the brake pressure in the wheel brakes during the wheel slip control process, wherein the vacuum brake booster amplifies the effect of the pedal force on the main brake cylinder during normal braking operation without wheel slippage, wherein a maximum vacuum brake force amplification is limited to a mean wheel braking pressure that represents normal braking without causing wheel slippage, and wherein when said mean value exceeds the vacuum brake force amplification, it is supplemented by said pump wherein said pump is configured to a level of pressure that is proportionate to pedal force, wherein the pedal force proportionate control of wheel braking pressure is adjusted by a piston subassembly which is installed in a casing in the braking system and is impinged upon by the pump, wherein the piston subassembly is mounted in series connection in the brake line downstream from an electromagnetic block valve, wherein the piston subassembly, which is arranged in a bypass path parallel to an electromagnetic block valve installed in the brake line provides, in its unexcited position, an unobstructed hydraulic connection between the brake force applicator and the pressure modulation valves positioned downstream from the wheel brakes.