Hissing in the footroom with brake power amplifier

Hello V8 lovers,



I've got a strange problem, it's smoking on the brake pedal and it's not the valve of the tempomaat. It really seems to come from brake boosters and there seems to be air to escape, but there is no air, or do I see something wrong? I dismantled the lower part of the dashboard and feet heating. When I press the brake pedal a little bit the hissing is much less, but it is still a bit there. He did this, with the old pressure storage 50% of the time, now he does it with the new always. When the engine is running, it takes a short while before it starts, and it's also a little longer there when I switch off the engine. I also looked into the laundry box but can find nothing there. I separated the main brake cylinder from the brake power amplifier but that doesn't make any difference. The only thing when the noise is almost gone is to print a little bit through the brake pedal.



I've been looking here but I haven't found anything (maybe because of my German).



Now I really don't know what to do anymore, do anyone have any idea or have they already done so?



I'm very curious, I'm grateful for every answer.



Many Greetings Willem