Stoptech technical paper on brake fluid types. More brake fluid information. As mentioned, my personal experiences with it have not been favorable. I originally put silicone fluid in mine, going along with the "benefits" that it was supposed to provide. I never had the spongy pedal, but after a year of having it in the system, I noticed a puddle under the truck. It turned out that the silicone fluid was leaking past the seals, as it had started to eat them. It also damaged the cups in the wheel cylinders as well. All of the parts were new, and had only been run with the silicone fluid. The wheel cylinders were ok after a teardown, thorough flushing, and new cups. The master cylinder however, required a complete overhaul, including honing out some rather nasty pitting from the moisture that had settled in the bottom. A call to the manufacturer revealed that they do not make parts that are designed to be used with silicone fluid. I went back to DOT3 glycol, and have not had a problem since.
