The other noise problem is far worse, but based on my research is not the fault of the brakes at all. The rear K-24 brake on the Trek Fuel sets off a resonance in the frame and the entire carbon fiber structure of the bike becomes a sound board. I can actually feel the vibration in the saddle and grips on steep descents when I am braking hard. And it is LOUD. A quick Google search reveals that most Fuel owners have this problem
, hopefully Trek has fixed this in the few years since my bike was made because it is annoying. In trying to troubleshoot it, Greg at Formula USA did share one piece of useful info, even though it turned out not to by my particular issue – he suggested having the disc tabs faced, and said that this solves the majority of the squeal problems that they had seen. Turned out not to solve my problem, but it is good to know. In any case, the other 3 sets of brakes don’t howl so I am chalking this one up as a bike design flaw.