Why uneven wear left rear brake pads only? on 2009 Toyota Matrix

1 side all worn the other 90% okay. At the same time no problem with the right rear pads other than a slight angled wear on both sides. Changed pads and within 2 years needed replacement again. Rear pads need replacing twice for every one time in front. currently at 60k km.

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1 answer
sounds you either have a seized caliper or the slide pins