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I bow to all the above. However, flushing the system with inexpensive isopropyl alcohol available at any CVS, Rite Aid, etc. is hardly going to hurt anything, esp. since you're immediately after running compressed air through it.

Then you add the DOT 5. Regardless of brand, all made by Dow Corning w/ telltale lavender hue. I urge people to buy it and all else at any NAPA store, since they cater to old cars, have better stuff than the cheesy chains for the same and often less money.

Again, after all your work, why install something hydroscopic, absorbing moisture from the ambient air, the only reason you have to rebuild master and wheel cylinders?

Glycol brake fluid, DOT 3 or DOT 4 (Girling) should be changed every few years. DOT 5 lasts forever, so the only parts you'll have to address the next couple centuries, given your mileage, are brake shoes. Eventually.

A friend has the same batch of DOT 5 in his '40 120, '40 180 Darrin, and '42 160 convertibles since the 1980s and it still looks new, as that in my '47 Super.