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Author Topic: Hissing brake servo  (Read 4505 times)

Offline pudding

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Hissing brake servo
« on: March 27, 2015, 11:08:31 am »
I understand a leaking brake servo is quite common the MK5 / 8P Audi A3, which causes an annoying hissing sound from the pedal area at low speeds and when idling.

Has anyone swapped the servo out themselves, or is it a ramp job because the engine has to be moved around a bit to get it out?
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Offline bacillus

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Re: Hissing brake servo
« Reply #1 on: March 27, 2015, 05:31:03 pm »
Usually it's a perished vacuum pump hose (as seen in the pic) that leaking and needs changing. Ignore the red circle in that pic.

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Offline scopes

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Re: Hissing brake servo
« Reply #2 on: October 22, 2015, 01:59:30 pm »
What is that nipple for on the hose that is marked with a red circle around it ???
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Offline bacillus

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Re: Hissing brake servo
« Reply #3 on: October 23, 2015, 06:09:59 pm »
Quote from: scopes on October 22, 2015, 01:59:30 pm
What is that nipple for on the hose that is marked with a red circle around it ???
On a mk5, vw has a block off rubber piece for that nipple as the original earlier ones didn't have it.
As for why it's there, haven't got a clue...
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