I agree with SuperDave's post but the reason that Dot 4 was developed was to make it more tolerant of the heat generated by modern disk brakes and to reduce the tendancy to absorb water from the atmosphere which would then boil because of said heat. As 70 year old brakes do not heat the fluid to any noticable extent the superior properties are rather meaningless. However it is easily available and will be totally compatible. Silicone fluid can be very hard to bleed as it can go around the bubbles rather than pushing them along the pipe to the bleed nipple.
David
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