1993 Camry 4 cyld (187k miles) tuppet n brake drum.

Hi all,I have 2 issue/problems 1) Can someone provide instruction on how to reset camry tuppet gap, what is the gap size& what do n don t for this job.
2) Rear brake,how to adjust or change? Any special tools needed,do n don t for this job. Thanks in advance Joeys
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