I have been struggling with my Cayenne 18Z brakes for 2.5 months now. Cayenne 18Z MBT 2 piece 350 x 34mm rotors Stahlflex lines OEM Fluid They are rebuilt and painted completely by Porsche in Holland, Initially I fitted EBC Greenstuff pads but from the moment I fitted the kt I noticed that after some hard abrubt stops it seems my whole car is falling apart up front and I hear a clacking clunking sound... Searched for ages but then my mate who's a mechanic took a drive and when I brake very hard and then go over a slightly bump road it starts to rattle and clunk (not a bit but very hard) but when you "slightly" let your foot rest on the brakes Ssssshh perfectly quiet ! We discovered the pads are not being pressed firmly by the pistons after hard braking , when I undo the pin on the caliper in the middle my pads just fall out If I let the car stand for a awhile after the symptoms occur the noise goes away and it seems the pads are being pressed again also if I drive the car from home to work very gentle and don't brake hard I don't hear the pads rattle or clunk but after 1 hard stop it's completely messed up and everything sounds loose I then tried new Ferrodo pads, another flush in the system and also new rattle springs on top ( OEM Porsche) also fitted those sticky pads on the pistons that supposedly stick on the pads and make em quiet but all with no affect And the weird thing is they brake like hell ! I Even when the kit is making the extreme clunk clunk clak clak noises over bumps and roads it still bites like hell but it's making me crazy !!! There are no leaks , everything is bone dry inside the caliper, no damage , new fluids, pads etcc Is this due to the stock master brake cylinder or is there something wrong with my calipers ? Quick pic to show off how good they look on the car Would be great to have this fixed cause we have checked EVERYTHING on the calipers/discs/pads etc and I'm really desperate and if I can't find it I'll need to take the brakes of the car and search another setup.