After yesterdays fun on the trails I had bad sounds coming from the rear brakes, even after a nice power washing. I just did the rears, I found some extra stuff that's not supposed to be there like rocks, dirt, string, twigs and leaves. Tons of it. I needed rear pads anyway so its all good but I think I'm going to at least disassemble and clean the fronts too after seeing all the junk that collected in the rear. Never had a problem before, also concerned with my pulleys which were making all sorts of noise after getting wet and dirty.