I have a set of the M4 Race Evo’s, bleeding them was easy.

The problem was putting the diaphragm and top cap back on. I could not separate the diaphragm from the top cap! I tried pulling them apart, but any more force and I thought I was going to split it.

Does the top cap and diaphragm separate so you can roll it in?

Yes, sometimes it’s really stuck on if not moved for a while. get under the edge of it gentle and prise it up a bit at a time.

Dammit. I’ll give that a try, they haven’t been touched for a year. 🙂