[chrismorse]

When working with anything older than about 10 years, I would not recommend manual bleeding, that is with foot power. (particularly if the system wasn't flushed on at least a bi-annual basis)

Over the years, crud develops in the system and each pedal push scrapes "stuff" down the bore, Then, you end up with a pile of trash at the end of a "normal" pedal stroke in the bore of the MC.

The "UP" and "Down" of the manual bleeding pushes the piston & seal way past its "Normal" range, right over that pile of trash in the bore.

While I was a service manager/writer, I probably saw almost as many master cylinder failures right after a brake job/bleed, (with foot), as with normal wear and tear.

I am giving the ATE blue a try, just to make sure I can tell when I have "all" of the old stuff out. Perhaps I'll go with Motul next time.

I like the Mighty Vac but use just a little vacuum, so I don't pull air past the caliper seals.

If you see any signs of leakage, torn/deteriorated dust boots, or notice stuck pistons during the bleed, it might be time for some caliper overhauling.

If you just try the caliper bleed & exercise, pay particular attention to brake pedal travel or pulling in the weeks going forward. I had a stuck piston in the 911 and a seized slider in my work truck.

chris