I have a E60 525i M54 late 2003, auto gearbox with 161000 km. Dealers made diagnostics and found brake booster is stiffed with water and they want to replace it for 1500 CHF! I live in swiss by the way. I think it is to much money for parts and labor! The unit it self costs 635 CHF! I can fin it on net for 300! so i would like to make the job my self! Anyone has any advice or link with diy, photo's? I tryed google, but not to much success!