Asked by Guru5B7X Mar 26, 2017 at 07:49 PM about the 2002 Audi TT

Question type: Maintenance & Repair

When letting up on the brake there is a "hissing "
sound!  Any ideas?

3 Answers


Sounds like it could be the power brake booster leaking.

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Best Answer Mark helpful

So will likely need to replace it , tighten it up or repair it? (Thanks for your help)!


The brake booster would have to be replaced. There is nothing a mechanic can do to fix it other than replace it.

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