BTW, I should add, I wouldn't have had the courage to try this without the help of the new power master service manual co-written by Richard Clark and John Norton.
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How did it feel when you were "bench bleeding" it on the car? It should have been fully returning on it's own at that time.
you'll be a Power master expert in no time flat
I'm not sure, I don't think the reaction disc could cause a return issue but not certain. It sounds like the booster section is still trying to provide power assist despite the pedal being released, which I think would be something going on with the valving inside the power piston #25
Well, I am tearing down the original that was on the car and I found this . This flange was not on the other PM (part #23) .
That flange is what it has to rest against.
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I don't see how the pin can stay in place without it.Just got though cleaning the parts with hot soap & Water and blowing the parts off with compressed air after. Now sitting in a sealed baggy(s) to keep them clean until the "O" ring kit to come in.
I don't see how the pin can stay in place without it.