A8 Quattro Sedan V8-4.2L (BVJ) (2008)
‹› Generally, the residual pressure valve - 2 - must not be loosened or removed.
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Seal both connections. Make sure that no dust particles enter the connections.
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Loosen the quick release fasteners - 1 through 4 - and remove the noise insulation.
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Remove the noise insulation bracket bolts - arrows - and bracket from the subframe.