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@wvm
Thread dredge.
I've noticed a ticking noise when braking, generally only when braking lightly. I had a look at the rim today and there was a very small raised piece of metal, not much bigger than a bit of grit. It looked like it was always in the metal and I'm guessing it is an impurity from the casting stage that was harder and has therefore not worn at the same rate as the braking surface. Anyway, 10 seconds with some fine sandpaper and it was gone.
My concern now is that the rim has worn to expose this small lump. So what's the way to check wear and when is it time to replace a rim?