Hydraulic vehicle braking system

A hydraulic vehicle braking system, comprising:

• four wheel brakes for four wheels that are distributed to a first and a second vehicle axles;
• a hydraulic external energy source;
• a control-and-regulating device;
• an electrically controllable service brake valve configuration situated between the external energy source and the wheel brakes, wherein the service brake valve configuration is controllable via the control-and-regulating device;
• a braking value indicator operable by a brake pedal, for performing service braking via hydraulic external energy using the service brake valve configuration;
• a dual-circuit master brake cylinder operable by the brake pedal, for performing auxiliary braking via muscle-powered energy;
• a normally-open operation mode switching valve controllable for the service braking operation in a closed position, the switching valve being situated in each brake circuit between the master brake cylinder and the wheel brakes supplied with pressure medium by the master brake cylinder;
• and
• a cylinder-piston configuration disposed between wheel brakes of a vehicle axle that is adapted to make a greater contribution to vehicle braking and the corresponding electrically controllable service brake valve configuration;
• wherein the wheel brakes adapted to make the greater contribution to vehicle braking are connected to the master brake cylinder, and wherein both wheel brakes of the vehicle axle adapted to make the greater contribution to vehicle braking are connected to a first master cylinder chamber, and wherein wheel brakes of a vehicle axle adapted to make a lesser contribution to vehicle deceleration are connected to a second master cylinder chamber of the master brake cylinder.