Hey all, I've recently rebuilt my hydraulic master cylinder as the seals corroded and all action was lost at the lever. All was good after the system was bled through, till gradually I noticed more free-play appearing in the lever. After one particually spirited ride, all resistance had gone in the lever, leaving me pretty much without a clutch. Now I and a trusted mechanic checked the system for leaks, but the resevoir hasn't lost any fluid, and there was nothing leaking from around the cutch casing. So we tried another bleed through assuming it was air in the system. Again, this was fine for about another few hundred miles, then same again. Help guys, anyone else experienced this problem?