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FWIW, I do an ISTAS cycle (at indie shop) pre-post season b/c I swap fluid types (c.$180, including Motul fluid, so not terrible pricing). They told me they got several ounces of clearly bad fluid from each caliper that had been left behind by hand bleeding procedure. And when you are fully opening up the lines (like for SS replacement lines) it helps to depress the brake pedal an inch or so - this closes off a passage in the MC so you won't drain out the entire system (they sell a ratchet-stick tool, but you can jury-rig your own easily).
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