One of my Cayennes had a leak in the brake booster vacuum hose. I have not heard of it being a problem with the Boxsters, but turns out that it's pretty common in the early Cayennes. Take a good look and listen up front around the brake booster, especially near where the hose bends.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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