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Golf GTI MK5 - Hissing noise in cabin – disappears when pressing brake pedal

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Husy:
Hey folks, looking for a bit of advice. I’m getting a hissing noise inside the cabin, and when I press the brake pedal it disappears. Has anyone experienced this before or know what the common causes or fixes might be? Any advice appreciated!

GVK:
Leaking brake servo or brake booster as some call it. Also check the hose from the vacuum  pump on the side of the cylinder head to the servo for cracks and leaks.

ZoliWorks:
Possibly brake booster hose or pcv to intake hose connections. In my case both were leaking

Husy:
Would a smoke test be the next best approach here?

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