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Corrosion on inside of new discs

  Clio 182 FF
Hi Guys.

Whilst changing the handbrake cables I noticed the inside of my ~6 month old discs have about a 1cm ring of corrosion around the outside of the disc like the pad isnt contacting properly. I used Brembo HC discs and Brembo pads when swapping them. What could be causing this? Not driving it hard enough?