Originally Posted by
dabac
Very rarely matters. The overwhelming majority of brake arms pivot against a bushing in the arm, not against the post.
Same thing applies, the post or bushing has to be greased or oiled. Whether the bushing is oiled on the inside (post) or the outside (the arm) depends if the design calls for the busing to turn with the brake or not. (some aren't bound either way and will either turn or not depending on where friction is higher).