Bleeding the brake master cylinder

[Flow]

Here is a picture of what I mean. Is that a rust risk ?
Or is the metal treated below the paint ?

[Flow]

Finally had time for a test drive today as the weather was not complete shit and I was home.
The brakes are now perfect. I haven't had this pedal feel in years on my car, there is good initial bite and the modulation is easy. I am super happy about it now.
Looking back at the entire situation, I strongly believe it was simply a brake master cylinder that was not bled correctly from the start, and the workshop that I asked to replace it years ago did not do a bench bleed of the master cylinder.
The booster might have had an issue too, but I did not notice any fluid inside.

The job was really messy but necessary.

Thank you everyone for the advices, especially about the bench bleeding part, I would never have thought of it, and it made all the difference in the end.


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