Brake pressure indicator in the combi instrument (I) is on

Hello. have a small problem with the brakes.I have taken care of a v8 3.6 automatic staple since 2002 and bought it with 206000 km.I have already read a little bit about what the problem might be but still hear some opinions where you should start to exchange. now for the try....

motor is made of brake pedal is rock hard,without bomb empty pumps immediately after the engine is off. it also doesn't matter how long the car is standing, is always the same hard the pedal. when moter runs pedal soft, slightly pulsating, at the pedal end slightly harder.servo steering goes quite normal.enough oil is on it. the switch under the brake fluid tank releases the ( I ) in the combi. from bombs return comes after moter start after about 2-3 sec oil out....