Mechanical Disc Brakes.

[Seajay]

Single piston is tough to adjust. Just not as much "option" in adjustment. We upgrade many folks to the BB7 for this reason. Seems to be a much more "easy to live with" version of the Avid brake.

[Owlie]

We think that part of the issue is that it was that someone didn't read the huge letters that say "DO NOT LAY FLAT" when putting the bike box on the truck. That, and it was packed TERRIBLY. (They basically taped the bike back into the box.) The piston itself needed work. (Luckily I have a coworker whose hobby seems to be taking bikes apart and putting them back together, so he fixed the front brake that was the problem.)

The back one still rubs a little, and everyone has pretty much told me to ride it a few times, and if it doesn't improve, go talk to our head mechanic. Sigh.