Moin, for those who are interested in it, I took a photo of the broken membrane of my SUV last week. Actually, I was only interested in what the part now looks like inside and where exactly the differences to the forge are. On the photo you can see something similar to a piston with a rubber bead around it. This is the membrane that should seal. In my case you can see that at the place where the membrane is always cracked, a crack was created. r to determine a clear wear on this kink (looks a bit like a brittle car tire). At first I thought my SUV was just “elegated” and not really broken. But now I have seen that it was broken. So an original SUV is either fine or broken. Something in between is not really there. Of course I don’t know if the spring is significantly losing power. MFG