Ah, yes, silicone brake fluid. Not quite as appealing as one of the major uses of silicone, certainly not as interesting.

Rick Ehrenberg would have most of the answers, being a long time silicone brake fluid user.

Now to the install: The DOT brake fluids are supposed to be compatible, so you wouldn't need to flush for that. However, DOT3 is hygroscopic, picking up water from the air. It is possible that little drops of DOT3 could carry enough water to make problems either by corrosion or by the water vaporizing from the heat of many brake applications. I had this happen to me in the Rockies, but that was with really old DOT3.

One problem that used to occur is getting air entrained in the silicone fluid. So not shaking the bottle, letting it sit for days after shipping, etc used to be standard. It'd be cool if there was an anti-aeration additive, but I haven't heard of one.

R.