After it rains, some rust appears. Braking scrapes this off. But is this pic normal?

/Angelo350Z/

Yeah those are normal. Even my 350Z with Akebono transplant brakes had those. If it really bothers you, spray your rotor hats and rusted area (after prepping, of course) with high temp paint and let your brakes "clean" off the excess paint.

Edit: Here's an old pic I found:

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2013 MB NISSAN 370Z SPORT