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> Inspection station in my state made comment to me that EVs are failing inspection for rusted brake components because of their heavy use of regen.

Are you suggesting some metal brake components have unusual rust because of disuse, where they aren't being used regularly enough for friction to "clean" their surfaces?

Otherwise I don't see how regenerative breaking could cause rust, since the braking force is supplied by electrical fields.

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>>Are you suggesting some metal brake components have unusual rust because of disuse

Yes, the brake disks, especially if you drive some place where they salt the roads during the winter. I had to change the rear disks on my hybrid after two years because they started to fall apart from rust, now I have learned to do some heavy braking at the end of trips to clean and dry the disks

its pretty obvious he's saying its because the main brakes dont get used because regenerative breaking is enough to stop the car.

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