S4 Quattro Wagon V8-4.2L (BHF) (2008)
Exhaust Pressure Regulator Vacuum Reservoir: Testing and Inspection
Exhaust Flap Vacuum Reservoir, Checking
Special tools, testers and auxiliary items required
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Hand vacuum pump VAS 6213
Test sequence
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Disconnect hose on vacuum diaphragm for exhaust flap at rear muffler.
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Connect Hand Vacuum Pump V.A.G 1390 to vacuum diaphragm.
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Generate vacuum using hand vacuum pump.
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Linkage must move toward front.
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Vent the hand vacuum pump.
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Linkage must move toward rear.
If linkage does not move:
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Check the linkage for ease of movement and check the vacuum diaphragm for leaks.