It's rust on the rotors which forms after washing, normal.
Mine does it 100% of the time if I wash the car and don't drive it until the next day.
Brembo's have very high quality iron rotors which are subject to rust.
Brake rotors on typical non-performance oriented new cars use a metal that is less susceptible to rust.
Next time you wash and park, look at the brake rotors prior to driving the next morning. Just one or two stops in the morning and the brake pads remove rust from rotors.
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