That's quite interesting. I've got a similar problem now, with the first brake the fluid just came rushing out of a slave. Now it's mysteriously disappearing even when the bike isn't being ridden. I love the feel of this brake, it's just such a pain in the arse to use, reminds me of riding back in 2001 when one had to bleed brakes a few times a day on a long ride... edit: this might be of use to you guys, i've found a neat way of bleeding the dengura which takes no more than a minute to do. All you need is a syringe without the plunger and with the appropriate M5 fitting. Undo the bolt in the lever, screw the syringe in, pour some water inside and pump the lever a few times. Done, it's fully bled