I have an Avid BB5 front disk brake on my 20" trials bike, and when I bought it from a shop that claims to specialize on trials bicycles, it had a pretty long front brake hose (80 cm/30"). The arch that the hose makes on its way from lever to the caliper is pretty wide, possibly making the force transition through the cable rather inefficient.
Nevertheless, I rode like this for a couple of years, and now that I finally decided to overhaul the brake and put new hose and cable on it, I'd like to ask this: does the arch the cable makes affect front brake performance in any serious way? I now have a Jagwire keb-sl linear strand hose, which they claim to be compressionless, so the cable probably doesn't flex much anyway. But I still want as much power from the brake as possible, so I'd like to know if making the hose shorter (and therefore more straight) will make braking any better.
And if it will, are there any potential downsides or compromises in doing that? I don't do barspins or tailwhips, neither do I plan to, so frame movement is probably not a limitation. But maybe there is some other kind of reasoning behind this setup that I'm not aware of?