RedFish said

Some aftermarket vendors will ship crap. I wish I had saved pics of the replacement drums one of our members posted. Those drums were so far out of balance that weights alone wouldn't correct so they had machined a lot of material off the outside of the drum. We know there's a limit to what can be removed from the inside/braking surface but evidently there is no limit to what a china man can remove from the outside.
Others have received wrong wheel cylinders and all this leads me to just refurbish the OEM parts when their condition allows. Sure I'll roll the dice in purchasing a brand new master cylinder but wheel cylinders are easy enough to renew. The kits will cost about the same as a brand new Chinese wheel cylinder. I purchased the wheel cylinder hones umpteen years ago so.... I use that and know the wheel cylinder is correct for my application.
I have had to buy new hardware kits or adjusters in few cases.
Many members have sent their dual stage vacuum booster to a vendor called "Booster Dewey" for reman'. I have yet to read any negative feedback.
Good luck any way you go.

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Mattax said

That's good. If you're really intent on going over everything, then sure take the MC off as well as the wheel cylinders. If they've been working fine, I don't see the need. If its been sitting or unknown, that's different. The bores will tell the story. If there are very minor imperfections, some crocus may take care of it. Any serious rust or pitting, its time to hone or replace as Redfish wrote.

Two other item that are worth a good look over. The hoses and the shoe contact points on the backing plates. The contact points, if worn, can be built back up with steel or brazing.

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