Are you a member of the Boxster register? They have an article on brake flushing with exactly what you are asking. You have to have a login to see it though I think.
PCA Boxster Register
In this article he bleeds 6 ounces out of each rear caliper (3 oz per bleeder) and 5 oz out of each front, to get a complete flush.
I am about to do a flush as well but luckily(?) my old fluid is dark from use so it is easier to tell
I recently had to bleed my front driver side and before I did I pushed the caliper pistons back using a brake pad spreader tool. I figured this would help me flush the old fluid that was in the caliper closest to the piston. When I bled I got a slug of ate blue from a couple of flushes ago... I am going to make this a part of my brake bleed workflow from now on. I also swapped my pads inside to out because the inner had less wear, I believe due to the cooling from my gt3 brake ducts.
Steve
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