1965 Dart front disc brake conversion low brake pedal

Can you tell how much "play" you have before you actually start pushing the piston in on the master cylinder? If you have little to none, the adjustable rod might be a waste of money. If there's some play there, then it could help. You don't want to have it too long so that it hangs the brakes on at all.

I don't know. I suppose I'd have to drain and look in the MC to tell for sure? Is there another way to tell? From full neutral to where the brake pedal starts getting hard to push by hand, the pedal play is about 2.5".