The brake booster is behind the pedal, and it is vacuum driven. But does the air flow feel it's being pulled out of the footwell or pushed into the footwell? Maybe it's just a crack in the grommet. Or an air flow from somewhere else.
The brake booster and the vacuum line to it are in the plenum chamber, under the fluid reservoir. On the passenger side of the firewall is just the brake pedal assembly.
https://www.ecstuning.com/b-genuine-...kaAl2fEALw_wcB
You see the connection hole for the vacuum line in the third pic. The post that connects to the pedal motion is in the second pic. Two bolts go through the whole assembly, through the firewall, and into threads on the pedal bracket to secure the booster.
If you're feeling an airflow right there around the post, it's going to to be the booster boot; there's no seal or grommet between the booster and the pedal bracket (other than the metal square you see there in the pics).
https://workshop-manuals.com/audi/a4...exploded_view/
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Originally Posted by Theiceman
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