hydraulic two circuit brake system for vehicles

The system has a dual circuit main braking cylinder (2c) with a brake fluid reservoir (2d), anti-locking device, brake pressure modulation valve arrangement and a return pump (sRFP) per brake circuit, an automatic braking device and an auxiliary pump (5) driven by an electric motor that can be driven to supply at least one braking circuit with a continuously increasing pressure up to a maximum value. An independent claim is also included for the following: (a) a method of braking a motor vehicle using a driver assistance system.