Set on four flush problem

[Sinnister]

Party Poker 0.50/1 Hold'em (6 max, 6 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with 8[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, CO calls, Button calls, Hero calls, BB calls.

Flop: (10 SB) 4[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, <font color="#CC3333">MP raises</font>, CO folds, Button calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP caps</font>, Button calls, Hero calls.

Turn: (11 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, <font color="#CC3333">Button raises</font>, Hero???? [img]/images/graemlins/tongue.gif[/img]

Okay, I know for a FACT that Mp-3 has aces with Ac and Button is a moron with maybe a queen and I know its getting capped, I folded the hand unsure of the odds with 11bb and 4 from each coming in on turn. What was the correct move?