I had the same problem, it was really hard to tell when the old fluid was out
I found a post somewhere where it listed the volume in the lines, don't remember where
IIRC, it was around 6 oz for each rear and 4 oz for the fronts each
I based my flush on volume.
maybe someone can chime in on this
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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