'70 Drum Brakes; when is rebuilding necessary? what should be done to optimize perfor

[darkone]

hey all, i dont know much about drum brakes, but im tearing all mine open for a necessary cleaning following my sandblasting. ive air blasted, and brake cleaner'd them, but i dont know how to identify if anything needs to be done to keep them in top notch shape. what should i look for, and what can I do to make sure sticking is not a problem? any help appreciated. thanks in advance!