The inner pad will always be the first to go. You may have to replace your pads. There have been instances that pad sets have been mixed up either at factory or in the shop where they are sold. The point is, you never know what might have happened to them before you got them. If this is bothersome, I would replace the pads, mike the rotors (replace if under spec) and clean the wheels. You should be OK..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..