My 67 (drum/drum) lost fluid in the rear well of the master cylinder, and my vacuum booster is evidently where all the fluid went. I figure there’s pitting and/or corrosion in the cylinder that caused it, so I’m installing a new master and booster setup. My question involves the rebuild. I want to purge the entire system with denatured alcohol then blow everything out and let it all dry before filling the system with DOT-4 (synthetic) fluid. Of course, I’m gonna check all the hoses for collapse and wheel cylinders for any issues as well before I do all that. Does that sound appropriate? Am I missing something/doing something I shouldn’t? I’m sure this all happened because DOT-3 fluid collects moisture, and I want to rebuild things in a way that mitigates a recurrence later on.