Hope has been making mountain bike disc brakes for longer than just about anybody, and earlier this year they launched their new Tech 4 lineup of brakes. So we sat down with Hope’s design engineer, Sam Gibbs, to talk about the new brakes & what changed from the prior Tech 3 models; how to choose the right brakes, rotors, and pads for you; and along the way we go pretty deep on the finer points of brake tech and all the tradeoffs inherent to designing them.