Hydraulic braking system with an auxiliary pressure source having a quick fill chamber

A hydraulic braking system with slip control comprising:

• at least one working piston guided within a brake pressure generator,
• a booster piston of a hydraulic brake force booster for actuating said working piston,
• at least one wheel brake connected to said brake pressure generator,
• an electrically actuatable auxiliary pressure source connectable to said brake force booster,
• a control and regulating electronic unit for detecting a wheel rotating pattern and for controlling a wheel brake pressure by means of pressure modulating valves,
• wherein an electronic sensor means is provided for detecting a relative movement between a push rod and said booster piston, said sensor means outputting signals capable of controlling the operation of said auxiliary pressure source, said auxiliary pressure source including a quick-fill piston inside a servo cylinder which is operated by an electrically drivable servo drive,
• said quick-fill piston being made with two cross-sections, a smaller one of said two cross-sections defining a modulator chamber within said servo cylinder which is connectable to said brake pressure generator and said at least one wheel brake by way of a hydraulic switching arrangement, and a larger cross-section of said quick-fill piston confining a quick-fill chamber inside said servo cylinder which is connectable to said modulator chamber by way of an annular duct.