Brake system and method for generating a braking force

The brake system (1) has two brake circuits with two pressure generating units, which are supplied with energy from two energy sources. A single error in the brake circuits is detected, where the faulty brake circuit is deactivated and a functional brake circuit is activated. A braking effect generated by the former pressure generating unit is greater than or equal to a predetermined operating braking effect, where another braking effect generated by the latter pressure generating unit is greater than or equal to the predetermined operating braking effect. An independent claim is included for a method for generating a braking force in a vehicle, particularly in a partial, high or fully automatically operated vehicle.