Originally Posted by mpolli

Where on the bolt did it break?

If you remove the bracket will there be a piece of the bolt sticking up? Then you could just use pliers. That was my thought.

Otherwise #3 is what I would probably try. I agree.

Do you know why the bolt broke?

Bad torque wrench? Yes, and if so, you might want to re-torque all of the bolts.

Maybe it was already fractured by someone else?