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Switching to DOT5 you have to flush your system with denatured alcohol. Pain in the ass. DOT5 is fully synthetic and does not corrode paint. It comes stock on Harleys because they expect their bikes to leak and they don't want to chew up fancy $10K paintjobs. You don't know HOW many Harley riders I've heard brag about this until I explain to them the reasoning. The reason you don't use DOT5 in high performance applications is that it is NOT hygroscopic. I does not absorb water, so the water ends up accumulating at the lowest point in the system (water is heavier than brake fluid), which is usually the caliper. Now instead of a 400C boiling point, you have a 100C boiling point. Bad things happen when your brake system boils. Most amatuer racers that I know won't even run DOT5 because the bleed/maintenance interval is too high.
IMO, nothing beats a good racing DOT4. Well maybe a DOT5.1 (also DOT3/4 compatible). I personally use Motul RBF600. Nice stuff.
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