you should be fine with autozone pads. i have rebuilt the rear calipers, all i replaced was the dust boot and the rollback seal (thick square one) the piston it self doesn't need to be replaced unless it's damaged, there's not much else to replace. what else were you thinking? i guess you could replace the slide pins and boots if those were worn, cracked, or stuck. i wouldn't bother rebuilding anything unless the caliper is leaking or stuck.
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