I know that flat mounts usually get faced but is post weld machining or facing generally done on post mounts? I wasn’t able to find information about it so I went ahead and faced these and maybe only took .001" off. Possible that I didn’t need to bother but I’m unfamiliar with this process so I opted to be better safe than sorry. So I’m just curious if this is something that people do or if its not really that critical. Thanks!
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Those look like they were machined anyway before you bought them! Unlikely to have moved much during welding/brazing I have used cast post mounts a couple of time and not machined them or anything. However, if you can, why not? There’s nothing like perfectionism 
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And there’s nothing better when installing a brake to have them perfectly centered and straight. I swear I can feel a difference when I use brakes with perfectly faced brake mounts.
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