Absolutely agree! DOT 5 silicone-based fluid is fine for a vintage car and will protect the system from corrosion, but you MUST remove every last molecule of the glycol ether-based fluid. This means new or rebuilt hydraulic components that were assembled with DOT 5 fluid. If you start with store bought new or rebuilt master or wheel cylinders, disassemble them, clean them with denatured alcohol and reassemble with DOT 5.

Buy new hoses and clean them as above.

If you don't buy new hard lines, thoroughly flush with alcohol and dry with compressed air.

When switching to DOT 5 the only way to go is start with everything clean and dry and begin assembly from scratch with DOT 5.

Unfortunately, domestic manufacturers never told us to change the brake fluid like Mercedes and most of the other European OEMs, and I learned 25 years ago that it was necessary for any car that you intend to keep a long time if you don't want to rebuild/replace the hydraulic components every 5-10 years.

The other solution is DOT 5, and if you're doing a frame up resto, that's a good time to convert, however, DOT 5 should NOT be used in ABS systems as it can cavitate under rapid ABS valve pulsation.

Duke