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OK. With the power bleeder up to 25, open a valve with the clear tubing running up and over a spring, then down to the floor to the reservoir. Use a high-power flashlight and look through the tubing. There are micro bubbles streaming out. This is not from the bleeder screw threads, since the power bleeder is making positive pressure and fluid is weeping from those threads, hence the rag needed to catch that. After 10 brake pumps, the bubbles stop, but only because they are very fast now and they make a cloud. The bubbles slow down half way through the tube and you can see them line up on the top of the tubing. After 20-30 min of this, the micro bubbles stop or slow. Then you know that line is done. Sometimes a cloud of bubbles came through, then a large bubble, then trails of small micro bubbles.
If you re-use fluid from the reservoir, it has to sit 5 min to let it de-gas after pouring it back into the power bleeder.
I did this to my rears first. Pedal came right back, felt fine. Drove around the belt route. Got back, noticed rears wearing fine but fronts still had L & R stamps on the rotor surface...no grip from fronts at all! Got 4-6 large bubble equivalents out and they bite now, but I am still going to have Porsche bleed them tomorrow to be done with it.
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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