I recently fitted M4s to my bike and they're smashing! But I have had some problems with fluid leaking from the reservoirs on the mono levers.
This is almost certainly exacerbated by the fact that I don't have much storage space at home and so the bike is kept stood up on its back wheel in the shed. But it could also be that I have failed to re-seat the seals properly after I bled the brakes.
So - has anyone else with the same levers, who has to keep their bike upright had similar experiences?
The answers to this have some serious implications, as I will have to knock down a wall in order to make space to keep the bike level!
mini levers have a small breather hole and that is probably whats leaking if you can keep the lever level when its in storage (slacken one of the mounting bolts and turn them upwards)