Take the free card?

[faughtandone]

so this is a hypothetical question based off of a number of hands i've played and i'm wondering what the best move is here EV wise.

you are on the button with three players and you flop a flush draw there is a small bet (approx 1/3 of pot) from the second player and both you and the first player smooth call.
on the turn a true brick hits and both players check to you.
what is the best play here?
should i A.)take the free card and try to make my hand cheap but surrender any real chance at stealing the pot
or
B)make a decent size semi-bluff and risk the possible checkraise.

i have encountered this situation a number of times and i go back and forth between the two, with every possible outcome... i am just wondering what you guys think is the best play.
and i know that there is no one set answer for how to play a hand.....depends on stack size....type of player etc...however just looking for general thoughts and input.
thanks