Fix the leak. Find out if one of your olives has a crack or something like that and needs replacing. Does your turbo pad work? I have had my brake blead with water for about a year and a half As long as you bleed it regualr with water i cant see it ever causing a problem, no matter what anyone says about it corroding the seals I would only charge you postage. And whatever new materials you want. my ghess is it leaking out of one of these... Where the red circle is, where the pipe connects, sometimes they get bashed, and pop or gradually over time it just seaps out of the bottom. ive had trouble with this in the past, and is easily fixed with a bit of new piping. Where the blue cirvle is is where the olive goes in, sometimes they can crack or again in time needs replacing Sorry if im telling you things you already now , The same thing can happen with the pipe connects at the lever, this has happened at the lever a few times to me, as the pipe gets bacshed, the olive might move slightly, oil gradually seaps out. Also make sure all you bolts are tight There all the obvious places, if the oil is not coming ut of there please specify cheers andy EDIT: If you sent it me, i would obviously get to the bottom of whats the problem. then fix the problem. I havent come accross a problem i havent been able to fix yet I enjoy working with maguras. probably my faverite maintance bit on a bike