Last staff -coda staff- position

[Pato Press]

Hi Lily's.

I'm trying to clearly put apart a single coda staff from the rest of the part. Pretty sure a common thing.
The thing is I'm lost :)

The file structure its easy (example):

###
\version 2.14.1

melody = { a a a a | c c c c | blah blah blah blah large one voice part }

% a simple 3 bars coda.
codaPart = { b b b b | d d d d | a2. r4 \bar "|." }

\score {
  \melody

  % clearly blank space for separating coda from part. As minimum of the default space or lets say height of a staff.
  % try adding lots of \break s do nothing ;)

  \codaPart
}
###

There's these old treat including these kind of thing but its rather confusing: "Codas - STILL can't get it right..."

Thanks
tdy.