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I have a Schwinn Rocket mountain bike with front and rear V-brakes. While removing the rear brakes to be replaced with higher quality ones, I managed to twist one of the brake posts out of the frame while it was still attached to the brake itself. It appears that the brake/post bolt is seized and won't budge.

How much effort should I invest into separating the bolt, brake and brate post trio? The whole train wreck is soaking in PB Blaster overnight, so I'll try one more time tomorrow.

It seems to me that a brake post is the type of hardware that I should be able to buy at any bike shop. However, as with anything coming from the highly balkanized bicycle industry, I'm wondering whether there are many sizes of brake posts out there. How can I tell which one I need?

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In repairing bikes for charity I found that there are several different common sizes, though not an enormous assortment (at least on less-expensive bikes). But you probably will need to get a used part from somewhere. – Daniel R Hicks Dec 21 '12 at 12:39

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I recently looked (in France) for break post studs and it was surprisingly difficult to find them. The only place I found it was a bike shop that would sell and repair the same bike I had to repair.

The major things that distinguishes break post studs are the diameter and the thread. There are many models (Is it proper to link to shopping sites that sell those kind of parts to show the kind of models?).

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Yes, it's proper, assuming you're not here to solicit – hillsons Dec 21 '12 at 7:29
Yes, no problem linking to a shopping site to show models. If you are affiliated with them in any way, you need to disclose that clearly. – freiheit♦ Jan 4 at 22:23
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I've visited a few local bike shops here in Brooklyn, NY and found that the part in question (referred to variously as a "brake boss", "brake post", and "brake guide") is extremely manufacturer-specific and is difficult to locate if a replacement is needed.

This prompted me to look on eBay and lo and behold! There's a treasure trove of parts similar to the one I need. I will update this answer with my findings once I've received some shipments.

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