Could be either, neither or maybe one or the other. It is hard to diagnose without being there. I would try going for the complete bleed of the system. Then see what happens. I would also pull the calipers and inspect for damage before bleeding, just in case something is amiss in there that we are overlooking.
I have also seen quirky things happen with older master cylinders.
Which year and model bike is this again?
- Nut
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