YRV Turbo front disc question

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Same problem on the standard YRV as the Turbo. The disc cunningly looks ok on the outside face but rusts on the inside face. Your car will fail the MoT on this. No problem though as new discs are cheap and simple to replace...if you use perfectly good pattern parts and not Daihatsu. Look on eBay. Unless there is something seriously amiss the inner and outer pads should use the same disc surface area.