I understand your concern about paint damage, but unless every piece of the brake system can be converted to modern-design rubber parts that are compatible with the silicone-base fluid, I'm concerned that you might be building in the possibility of a sudden, deadly failure. How about a failure of a flex line in traffic or something similar involving the failure of a wheel cylinder cup or a master cylinder piston seal? I doubt if it would be possible to observe the operation of an older style seal under load without some pretty extensive testing facilities. Simply soaking parts in fluid and looking for gross deterioration isn't sufficient where a safety-of-operation part is concerned.

I'd suggest using conventional DOT 3 fluid, and fabricating some sort of clear plastic shield to protect areas likely to be exposed to possible fluid contamination. That kind of concession to non-standard stuff on a restored vehicle isn't any more off the wall than doing a multi-layer frame painting procedure. I'm pretty sure your truck didn't roll off the assembly line that way, did it?
Jerry

Last edited by Hotrod Lincoln; 01/28/2014 2:05 AM.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!