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Yeah, the three-headed hydra vacuum brake line threw me for a loop since it is not depicted in the parts diagram, which just shows the non-turbo version. What had happened with mine was that the long vacuum line behind the firewall had split at the fitting to the three-ended line, so I replaced both the long one and the three-ended one. I didn't spend a lot of time figuring out where all three ends went, though. One went to the electric vacuum pump, one went to the brake booster at the master cylinder, and the other went somewhere else that I assumed was related to the turbocharging machinery. If memory serves, it pulls a vacuum through that line toward the vacuum pump. But maybe it was the other way around and pulled a vacuum toward the intake manifold so the electric vacuum pump only has to work when the throttle is open?
All I know is that replacing both lines fixed the brake booster warning...and cost me a watch since one half of a link decided to fall into the depths behind the firewall beyond where I could fish it out with any tool on hand. Typical Porsche--it demands sacrificial blood, tools, and even jewelry every so often.
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