Dot 5 brake fluid

Have used DOT 5 in all my non-ABS cars for years. Never a leak and no more rust issues. The best endorsement I know is that the U.S. military uses it. Not sure why you blame the silicone fluid for your caliper leak. There were some cars in the 50's that could only use silicone since glycol fluid would eat the seals. The story that you must totally flush the old fluid out is bunk spread by clueless auto parts guys. The only issue is that if you leave drops of old glycol fluid, that is places that can rust. I have always used it when totally rebuilding the brakes, so easy to blow alcohol thru the tubes.

Other brake fluid trivia. Some pay extra for "synthetic" DOT 4. That is marketing bunk (Valvoline I recall). All brake fluids are man-made and thus synthetic. There is now DOT 5.1. It is not silicone. It is the first glycol fluid to meet the DOT 5 standards. They named it "5.1" to not confuse with silicone since it will still rust your system and remove your paint.