DOT5 is just fine. I put a Ford disc brake 9" in my 68bird last year and the brakes worked fine. Been using DOT5 for the last 3 years in all the toys. But there are big differences in Master Cylinders. When I buggered up my first 1 from a Caddie I started looking for a replacement.
While all the porpotioning valves from the 4 wheel disc cars looked the same I noticed different bore masters and then I got curious and started opening them up. Looks like they have a 'pill' in them restricting the fluid flow. Same bore, same brake setup, different pill? And to make things worse both my part suppier and junkyard x-over books indicate they are all the same. I found what I was looking for eventually. Good luck with you problem. Side note, just pulled the 9" and replacing it with a 12 bolt from a 70 Nova, drum brakes. fun again
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