The brakes are 80mm and are off a newer pair of FKS bindings, so they are not brittle like the ones that originally came on the bindings. I would suggest bending them without heat if you are putting them on anything narrower than 95mm, but if you want to go wider than than, I would use MAP gas. I have done multiple pairs with and without heat, and it really isn't hard if you have a few tools and common sense. This post does a pretty good job at explaining how to do it with heat: http://images.media.nscdn.com/ns/forums/readthread/thread_id/392552/
A good video on how to assemble/disassemble the bindings:
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