It's time to replace the lines, the wheel cylinders, the master cylinder, the tees and the unions, and switch over to DOT3, DOT4, or DOT5.1 fluid.
Silicone fluid is wonderful where actual fire resistance is required, or resistance to boiling under _racing_ conditions is required, but it leaves the system susceptible to pinhole corrosion, where a tiny droplet of water falls to the bottom of its local enclosure and slowly, steadily, inevitably, eats a hole in whatever ferrous metal (including stainless steel) it happens to contact.
Since you wouldn't intentionally spill brake fluid on your car's paint anyway, it's not a real good reason to use silicone fluid.