Hydraulic Brake Cylinders

[Terrytuned]

Like Greg I have used silicone brake fluid for over 20yrs in Austin Sevens it does not absorb water and does not seize brake cyls when over wintered. Our first race car we used DOT 4, at the end of the race season it was winter stored for about 4 months when we were preparing for next season we found most of the brake system was seized it was stripped flushed and seals replaced silicone brake grease applied to the cyls  and refilled with DOT 5 Silicone brake fluid we have not had a seized cyl since nor have we had to replace any of the seals so I don't what your problem is with silicone fluid. I have also done quite a few hydraulic conversions and always I advised to use silicone fluid, and have not known of any problems.
                                                  Terry.