Brake sit “soft” at Opel Movano/Renault Master

Hello, with my 3.0 Movano there are always theatres with the brake. Now the rear brake system has been changed to the second mail within a year. What irritates me particularly is that the brake pedal feels really soft when I step on it. If I stand at the traffic light and step on the brake pedal, the pedal gives up almost to the bottom sheet. At the beginning this was not the case. At my Ländmovano the brake was the same as I knew before. Solid and clearly defined Druc When I had my car again, I had quite problems getting used to his brake at the first meters. The braking effect seems to be ok in itself. It’s only started after the first brake repair. The Opel master thinks, “You couldn’t do anything. That would be just like that for some vehicles. Opel would have tried a lot but never found anything.” The brake used to be really cool for my taste. What do our car mechanics say about this? Have you ever had such a thing before? Why is that? Do I really have to live with it? I am grateful for every hint. Unfortunately, I did not cause a total damage to every complaint with an external crankshaft, the problem is that it is ignored by my Opel dealer or blown off as above. I am grateful for no warning. Greeting Karsten