What if I don't change my Master Cylinder on a disc conversion?
It will be fine, just remove the residual pressure valve
and check the fluid at every oil change.
Might need the adapter plate to do a change over if you
go that direction.
Use the small bore M/C.
Might up your life and accident insurance and
keep a lawyer on retainer just incase you run
into a fear monger that's sue happy.