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Interesting topic. Never really gave it much thought. I suspect the folks that have rotors that rot away live in flat places. I can see how someone in the flat parts of the midwest where they also have harsh winters would have this problem. No real worries here in hilly New England. Even the best hypermiler has to do a good bit of braking here.
I do wonder if for hybrids it might make sense to look at going back to the stone age with 4 wheel drum brakes which due to their design are less likely to rust. There is no need for the added cooling abilities if regen is doing the majority of the work.
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