Like Cyccommute, I like my brakes to engage fast and have no chance of bottoming out. I keep my brakes adjusted to where they're as close as possible to actually dragging as I can get them. Generally on the BB7s I adjust the inside disc first then the outside, in each case I adjust up, then apply and release the brakes and spin the wheel, if they don't drag give them another click or two, when they start to drag, back off a couple of clicks.