Flushing Brake Fluid

[Steve Sherman]

Started in on flushing the brake fluid and did not get too far.  Thought
I'd begin by emptying the res as bes I could with an old turkey baster.
 Only problem is I could not figure a way to get the filter screen out,
to get access to the fluid.  Does that filter screen assembly come out
of the res tank?  If so, can someon let me on the secret of how to do it.

If not, I assume one drains the res by separating it from the master
cyl.  If that's the case, does one usually need new grommets to reattach
the res?

TIA