A4 Quattro Wagon V6-3.0L (AVK) (2002)
Vacuum Pump: Testing and Inspection
Cruise Control Vacuum System, Checking For Leaks
Follow the sequence of operations below:
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Remove vacuum line from vacuum pump.
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Push diaphragm on actuator inward.
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Plug removed vacuum line.
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If actuator diaphragm remains pressed and does not move: system is airtight
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If actuator diaphragm returns to its original position: system has a leak
NOTE: Malfunctions can be caused by incorrectly set vent valves, leaking actuators or by cracks in the vacuum lines.