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bluedog
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Posts posted by bluedog
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Try this
http://www.6speedonline.com/forums/cayenne...-installed.html
I just got a set in today and will try this weekend
brake booster faulty
in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)
Posted
Does anyone know if the vacuum pump has a relay?? I have had the brake booster light on and off for a month. Yesterday I went to push the brake and it was all leg to stop the 6k lb. I have read most forums and checked all the hoses, pressure tested the line, etc. I took the vacuum pump off and cleaned it, and tested it with a 12v powersupply and it ran well. However, when the pump is connected to the car it turns on just after start up for 5 sec or so and shuts off. This is even if the vacuum line is disconnected from the pump. Ergo, is there a relay that is not doing its job to tell the pump to run longer or at all?
Thanks