From what I understand, it seems like the inner pads just rusted in place from not being used. Breaking them free or installing new pads should solve the problem then as long as both pistons move freely. As long as the pistons slide cleanly, then just remove the rust, and the calipers should still be good.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record