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I would wonder about the brake booster diagnosis. It is there to assist the pedal braking effort not really hold or let-go-of brake hydraulic pressure. Is it possible the brake pedal linkage is binding? Perhaps it's the ABS unit. Perhaps it's something wrong the caliper (binding?). Are you sure the other rear is locked? Do the fronts lock? When you did the master cylinder, did you bleed the ABS unit? Did you pressure bleed or use the old-school two-person method? Tony's suggestion to take to an experienced Porsche shop (with brake experience too) is appropriate.
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John - 2005 C2S 997.1 at ~82k mi
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