Tire mixing should be no problem, but if it were me, I would have pulled all four drums to inspect the brakes. I would be concerned about having broken parts in the brake mechanism, and also possibly having grease on the shoes. Grease contamination could cause the shoes to not want to release from the drum surface, which may have been your issue.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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