I was referring to the situation described by @
CSG Mike, but like I said it is a very minimal chance (and honestly something that could happen with most any upgraded brake setup).
My point is very much in line with Andy's from RCE,
"So...no the car won't explode on the way to the supermarket, but there is a shift in brake bias that I don't like. I try to put parts on my cars with a functional effect that I do like. That's my priority."
Yes, the vast majority of the time the kit will work just fine in most situations (exception being a car that is tracked heavily). However, there are certain impacts it has the car that a BBK designed specifically for the application would not. If people want to do this swap with that knowledge, that's perfectly fine. It's their money and their car.
Like I said, I don't see this thread as fear mongering. I haven't seen anyone say, "Doing an STI brake swap
will cause you to crash and die." Sure, every thread has it's fair share of your typical forum commenters just stirring things up. But what I've found important within this thread are some people (like CSG and RCE) with a lot of track time, knowledge of, and experience in the 86 platform that are pointing out some important factors that many people may not take into consideration when modifying brake components.
And in terms of the, "by that logic you shouldn't touch anything." Yes, if you really want to minimize the failure of parts it is much wiser to leave everything OE. Anytime I modify something on my car, I accept the fact that there's a decent chance I have reduced it's longevity. I'm not arguing against that. However, there are ways of doing the same type of modification that will prove better than others. From what I've seen, heard, and experienced with near stock power our cars really don't need much in terms of a brake upgrade beyond pads, fluid, and perhaps SS lines. I think a lot of people do the STI brake swap and BBK upgrades for the way it visually changes the car, and it's important to think about and weigh the other effects of the upgrade vs. the visual appeal.