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I have just had this issue as well on my 63 CX5. MPG dropped over the weekend but figured it was DPF related as had done a lot of short journeys. Cruising along the motorway and car started juddering, got out and found smoke bellowing from NSR wheel. Mazda now advising it needs 2 new calipers and RAC warranty refusing to pay as they say it will be cause by corrosion and therefore not covered by them.Anyone ever got anywhere with Mazda outside of warranty as seems a very common problem...Also does not seem to be any aftermarket calipers as far as I can find, anyone know of any?