Good info. A little background on what I learned over the years about brake fluid. Dot 5 is silicone based but the reason is that when the spec came out only the silicone fluid could meet it. Being silicone based was not a requirement but that is what transpired. Like Jack said H-D used silicone based Dot 5 for a few years and from my experience it was a failure. My '99 ultra would lose its rear brake any time I was riding in the mountains. I'd have it bled and it would work for a while then malfunction again. Reason being that the air bubbles in the Dot 5 are very, very, very, very difficult to remove. And the rear brake hose having to go up and over the caliper would tend to trap air at its highest point and when at altitude air expands and voila, no rear brake. Of course I didn't know or understand all this until years after I'd traded that bike. So I absolutely deplore Dot 5 fluid.
There is a newer Dot 5.1 that is glycol based like the other fluids and it is said to be A-OK but I've not tried it.
As for flushing the fluid every two years I am now a believer. Few years ago riding two up pulling a trailer going up the Sandia Crest Byway I lost both my rear brake and my clutch due to the brake fluid getting too hot and boiling in the lines which run way too close to the hot exhaust. After cooling off for a half hour or so everything functioned normally but I got the lines flushed asap at the dealer in Santa Fe and the fluid was beyond nasty - it was hideous. So at least every two years flush the lines for sure for optimum functionality.