Quote:
Originally Posted by The Radium King
ah - the third end goes to the brake booster. prolly just to give addnl vacuum to the brake booster because on a tip you stay on the brakes at idle whereas on a manual you would just release the clutch.
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I think you figured it out. I should have been clearer in my first post rather the posting a confusing link.
The overall function is that it is the brake booster vacuum line.
On a manual transmission there is only an elbow fitting at the left front of the intake manifold (no. 23):
On the Tiptronic there is only a blank cover in that position. The Venturi tube connects to the right rear intake manifold and additionally to the pre-throttle intake, then terminates at the front left to connect to the booster line. The effect is greater vacuum.
