A new hydraulic booster concept with internal ratio is working with the CC-principle. In case of a failure the required secondary braking performance will be achieved with ergonomical pedal effort and pedal travel.Different brake splits will be obtained with a minimum of changes. This is also the reason why the ABS booster requires the same number of modulators and control channels independent of the brake split.The control philosophie with MIR (modified individual control) at the front axle and individual control at the rear axle is recommended for all drive train concepts. Even with locked differentials the ABS- control remains active. The special booster concept permits easily a system extension for the purposes of drive slip control.