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Has to do with the specific proportioning for each model.
There's a lengthy thread on the subject that convinced me to gut the valve.
Couple of notes - if you do, be sure that all the internal components (springs, discs, o rings, and stoppers) are removed before you re-install. I left what I thought was a part of the valve inside - turns out it was supposed to be removed. (you should be able to see daylight from one end to the other)
Also bleeding is a bear. When all is said and done, it's best accomplished the old-fashioned way with a pedaler in the driver's seat an a bleeder at the corners.
Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera
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