Writing in english, i cant speak any german. If your springs are noisy, clonking, when driving slow. The only thing you need to do is lift the front up. and put small FILT pillows (the ones you use under your chairs so they dont scrathes your floor) you put them between the coils where they touch each other. use 4-5 on every coil, it works great and all the noise from your springs is gone.