A few month ago we upgraded the front brakes to a double piston setup. After a while they had some surface rust on it. As you know I hate rust and like to tread it before it is too late. I found a good deal for a brake caliper paint kit* including cleaner. So I took the brakes off again, cleaned and painted them properly. The yellow colour is not my favourite, but they are going to be dirty again anyway. The main thing is that they are better protected now.