Originally Posted by Retro Grouch

Besides the brake issue which others have discussed, I think that you also may have a front shifting issue.

Shimano says not to mix and match road and mountain bike shifters and derailleurs. I'm told the cable pull for the front shifters is different. I know that you can use a flat bar shifter with a road front derailleur but I've heard mixed reports about using a drop bar shifter with a mountain front derailleur. I've never done it myself so I don't have first hand knowledge. Of course, if you decide to use the much less expensive bar end shifters, that would solve the problem.