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They definitely can. I bent a mounting bolt like that and was able to take one from a similar brake and swap them.

sorry i should have worded it "any idea where i can find replacements?" i dont have any brakes to pull a bolt from.

i found this http://www.jensonusa.com/store/product/BR407Z03-Shimano+105+Br5600+Pivot+Bolt+Assembly.aspx

but would this work since theres some bolt left? http://www.jensonusa.com/store/product/BR401Z01-Problem+Solvers+Steel+Brake+Mounting+Nut.aspx

i'm not sure what exactly the bolt you're looking for is like, but there's at least a decent chance you can find one that'll work for you at kraynick's. i dropped a few nuts and bolts under my porch earlier this spring, and i just went there knowing the diameter/threading (i brought a bolt of the same threading and matched it to a nut, then used that nut as a measure) and the length i needed and looked through his boxes and boxes and drawers and drawers until i found what i wanted.

and i don't think he charged me for them, after i bought a few other things.

I don't think anyone cut them down. That's actually somewhat hard to do w/o ruining the threads. Typically the shorter post is for rear brakes and the longer one for front brakes. The brakes themselves are (usually) the same otherwise.

You can buy a variety of different length bolts. Just roll into Kraynick's with the brake in hand and find what you need. The goal is to get as much thread engagement as possible. Like 4-6 turns.

they were definitely cut down. its actually pretty simple to do, just thread a nut on to the bolt past where you cut it, and then when you take the nut off it takes any burrs off the end of the threads at the cut.

i'll check out kraynicks, annoying that this bolt has two different diameters, a larger diameter to hold the brake together, and then smaller diameter for attaching to the bike.

i have had this very same problem on lots of bikes iwth the same brakes... consider putting a nut inside the fork and or using the front brake on the back... i have done both in a pinch and then left it because it works just fine. that actually might be why they were cut.

that'll be possible for the front, i don't think i'll be able to make the rear brake work... since this is going to be a fixed gear perhaps a front is all i'll need, though i do like having two brakes.

the longer of the two bolts just barely goes through the rear frame, leaves me ~2mm where i'l supposed to try and thread a nut on.

i think i have found my solution so i'll share it (if anyone cares).

I'm going to buy a steel threaded rod and bolts to match from home depot, and then weld the threaded rod to the bolt stub. as long as the weld diameter is the same as the overall bolt, the threads won't matter because the welded joint will be inside the bicycle (either inside the front fork or inside the framestay)

That seems like a lot more work, and potential for failure, than just finding an otherwise broken caliper brake and swapping the bolt.

Did you check Kraynick's?

If it were me I would rather replace the stud.

If Kraynicks doesn't work for you, check McMasterCarr. If they can't solve your hardware needs, I don't know what to tell you.

something random for that 2 mm... often times the little nut that threads onto the threads on the stem of some tubes is the same size and thread as the bolts you're looking for.