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Originally Posted by brp987
From Bentley: "Brake bleeding on vehicles with ABS/TC 5.3 and PSM requires the Porsche System Tester 2 (PST 2) to activate the valves in the hydraulic unit for proper bleeding."
I believe the PST 2 is software/hardware. I've never seen it for sale, but have heard it's in the thousands of $.
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Thank you. I will investigate. I had hoped to do it myself.
