I've got a Giant Cypress with Hayes disc brakes. I dunno what these bicycle designers are thinking, but there are probably thousands of car designers who could tell them that FIXED SINGLE-PISTON CALIPERS are a lousy idea!
No matter what, they rub, unless I open the clearance up so far that the brake levers almost touch the handlebars. I can adjust them until they stop rubbing, but they start again in a day or two. Remove the wheel? Better adjust the caliper again!
They don't usually rub bad enough for me to feel a drag, but they rub enough to make an irritating sound.
So anyway, here's my idea. The calipers have slotted mounting holes to allow you to adjust their position. Why not remove the bolts and caliper, coat the face of the caliper mounting surface with grease, coat the threads of the bolts with loctite, reinstall caliper and bolts, but tighten the bolts about 1/8 turn less than tight, just loose enough to allow the caliper to slide back and forth easily. The loctite ought to keep the bolts from backing out, and the grease ought to allow the runout of the rotor to push the caliper into a non-touching position any time the brakes are not applied.
Anyone tried this? Anyone who hasn't tried it but thinks I'm a (genius, idiot, fill in the blank)?
Many single-piston car brakes work on basically the same principles, except usually they slide along the mounting bolts instead of perpendicular to them.