[jon jay]

:?Where did the clutch brake fluid (DOT 4) go?:?

Most of the time that diaphragm just needs pressed back into shape like Ken said. I'd run a lot of brake fluid through the system if the diaphragm truly is misshapen due to contact with some caustic chemical.

my 1200 has dot 3 only stamped on the lid, would it be better to use a dot 4 fluid