A quick search brought up this information:
SILICONE BASED FLUID
Fluids containing Silicone are generally used in military type vehicles and because Silicone based fluids will not damage painted surfaces they are also somewhat common in show cars.
Silicone-based fluids are regarded as DOT 5 fluids. They are highly compressible and can give the driver a feeling of a spongy pedal. The higher the brake system temperature the more the compressibility of the fluid and this increases the feeling of a spongy pedal.
Silicone based fluids are non-hydroscopic meaning that they will not absorb or mix with water. When water is present in the brake system it will create a water/fluid/water/fluid situation. Because water boils at approximately 212ยบ F, the ability of the brake system to operate correctly decreases, and the steam created from boiling water adds air to the system. It is important to remember that water may be present in any brake system. Therefore silicone brake fluid lacks the ability to deal with moisture and will dramatically decrease a brake systems performance.
From the website:
http://www.afcoracing.com/tech_pages/fluid.shtmlOne thing you might consider is switching to a newer master cyl. I run the master cyl's from a 1998 Ducati 748 on my Paso. But my favorites are the 1999 and newer ones, with the silver levers. For the price, that is. (I'd like a Brembo radial, but I've only got one and it's on my YSR) You can pick the 1999 and newer ones on eBay for less than the cost of a rebuild kit.