RS 4 Quattro Cabriolet V8-4.2L (BNS) (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 or hand vacuum pump V.A.G 1390
Work procedure
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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 or VAS 6213 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 hand vacuum pump.
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Linkage must move toward rear.
If linkage does not move:
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Check linkage for ease of movement and check vacuum diaphragm for leaks.