I'll explain the best I can..
Ok first off, I have a 38mm ronnie in a 100mm frame with 4 bolt mounts. I'm using red bloxx with plenty of material left and I fixed my TPA bolt about a year ago. What I'm trying to get at, is that nothing is broken, it all works fine.
Anyway, on the left hand side of the frame (as you look at it from behind) I have the brake cylinder set half way in the mounts and this side is fine. Also this is the side at where the main hose comes in from the lever.
On the right hand side (see THIS pic), the brake cylinder is set in as far as it can possibly go ( A ) and there is still a major gap between the pad and rim ( B ).. "Oh so wind the TPA in" well yeah it's wound all the way in (but usually when the TPA is wound all the way in the pads sit further away from the back of the cylinder.. on mine they don't, they are still firm up against the back) "Oh your wheel must be out of dish" nope, the wheel is perfect.
So my only conclusion is that the brake needs a re-bleed as there has been a loss in fluid since that last bleed. If I re-bleed this will be the 3rd bleed it has had in 2 years.. Good?
Well the thing is, I don't have a bleed kit and currently my brake is bled with magura fluid so what I propose to do is bleed it with water by removing the complete brake from the bike and submerging it in a bucket of water (I don't have anti-freeze but it doesn't get that cold down here anyway) and removing the bolts and pumping the lever until all the gunk is out then fill up the bucket again with fresh water and then squeezing the lever to pump water back in. My friend has done this before but I remember him saying something about you have to keep a finger over a hole when pumping the lever? Which one?
Any help on this will be most appreciated :)
Sam
(Yeah I missed some full stops up there ^^)