A8 Sedan V8-3.7L (AEW) (1997)
Vacuum Pump: Testing and Inspection
Cruise Control Vacuum System, Checking For Leaks
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Remove vacuum hose from vacuum pump and plug hose.
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Remove driver's side instrument panel trim.
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Push in actuator diaphragm and at the same time push brake pedal down to point of resistance.
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Release brake pedal.
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The actuator diaphragm must not move.
NOTE: Incorrectly installed vent valves, leaking actuators or cracks in vacuum hoses can lead to malfunctions.