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Hi all,

Just to contribute to the information pool. I had P1136 pop up yesterday. Fortunately, I noticed that the green cap on the nipple was cracked and sucking air. I removed it and capped the nipple with super glue. It is now air tight. After driving an hour or so, the CEL light is gone. Besides, the brake is more responsive as the leak was part of the brake booster system.

P.S:1 I have no idea what that green cap is for. Also, it did not improve the vibration problem.
P.S:2 Engine is 98', 1.8t.
 

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My little green cap did the exact same thing (1999 AEB). It sort of disintegrated in place. I replaced the green cap with a rubber cap.
 
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