Looks like I'm late to the party since I've been on vacation. Brakes are definitely not easy. Between custom seals, custom tools, and some necessary knowledge that isn't widespread, good brakes take a lot. I would say they are either third or fourth most difficult thing on a bike behind the frame itself, the fork/shock, and, depending on specific design, the dropper. Some droppers are pretty simple, though. Frames are only on that list because doing a full blown production run requires tons of testing and the tooling is more complex. Brakes definitely are not something that anyone with a...