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@Gingersnaps
These springs can wear - especially if you have run the brakes with worn pads for extended periods. So, assuming all your pivot points arent seized , and the end of the spring is in its little sheath and moving freely - this is the most likely explanation. New springs arent cheap though - Alternatively you may need to adjust the tension on the pivot bolts - but I assume youve done this if youve already disassembled? Finally ,theres a 2mm hex bolt to adjust spring return tension on the drive side of the caliper, just above the pad.