E-Class (W212) 2010 - 2016: E 350, E 550

Air leaking sound when pressing brake pedal

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Old 06-13-2019, 08:03 PM
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2014 E350 4MATIC
Air leaking sound when pressing brake pedal

Hey folks! Bought few days ago 2014 E350 4MATIC, and today found my first problem - annoying sound somewhere from brake pedal, when I'm driving at low speed like parking lot or stop signs and pushing brake pedal (5-10%) I'm hearing this sound, mostly like from vacuum booster, I read about booster seal but can't find this thread now but there was problem with DEPRESSING break pedal, attached video with clear sound, please suggest!




P.S. I had 2017 Accord before, E-Class is pretty fantastic

Last edited by Maxxxx; 06-13-2019 at 08:59 PM.
Old 06-14-2019, 06:06 AM
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2014 e250 bluetec
LOL this reminds me of my clown horn brake pedal when I first purchased my w212. Same issue. It's the brake booster, it needs to be replaced.
Old 06-14-2019, 07:12 AM
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2011 E350, 2015 E350 Sport
Yep.......Brake booster needs to be replaced
Old 06-14-2019, 10:37 AM
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W203 W212 W211 R53MCS
That sure is your brake booster..... never had one failed or leaked. Funny sound
Old 06-14-2019, 11:37 AM
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2013 E550 4MATIC - P1, P2, SPORT
HAHAHA. Sounds like you're stepping on a goose.


... not that I know what that sounds like...
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KEY08 (06-14-2019)
Old 06-14-2019, 02:46 PM
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2014 E550-sold 😩
Now we all know that sound, which is very distinctive. Thanks for the video!
Old 06-14-2019, 05:03 PM
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2013 E550 4MATIC - P1, P2, SPORT
Someone should overly the OP's video with the audio from this:

Old 06-24-2019, 03:19 PM
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'71 Pinto
See attachments.
Attached Files
File Type: pdf
Checking brake booster.pdf (284.9 KB, 332 views)
File Type: pdf
install brake booster.pdf (242.7 KB, 235 views)
File Type: pdf
install master brake cylinder.pdf (352.0 KB, 147 views)
File Type: pdf
install wiper system.pdf (543.3 KB, 131 views)
File Type: pdf
Remove and install wiper arm.pdf (718.9 KB, 367 views)
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Old 07-02-2019, 04:35 PM
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2014 E350 4Matic Sport
konigstiger, thanks for posting up the documentation for replacing the brake booster.

That'll make life easier when I put the new booster on my wife's e350. Funny thing, since I bought the new booster & put it on the shelf in the garage, the original booster hasn't squeeked a single time.

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