I have used DOT 5 Silicone fluid in several of my vehicles for years with no problems. The first vehicle I put it in was my CJ-3B Jeep that has a marginal drum braking system. I did not notice any change in the brakes, good or bad, but the silicone fluid has been in for 10+ years with no leaking cylinders or other problems.

I am on coastal northern California with fairly high humidity.

A short article on brake fluids: http://www.mossmotors.com/SiteGraphics/Pages/brake_fluid/page1.html

Dave

Dave White
2003 Plus 8