Brake booster faulty Porsche Cayenne 2005
2 Answers
check to see if the vacuum line to the booster is good or possibly diaphragm went bad in booster.
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Remove passenger side engine cover and unbolt the vacuum pump brackets two 10mm fasteners, unplug and disconnect spider hose. The firewall hose connection is likely to have a split at the joint. Wrap it with a self-fusing silicone tape and the message will go away after restart.
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