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Is a small hissing noise from brake pedal normal?

Old 01-21-2019, 07:10 PM
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Wow , yes I never expected to have some many issues either , I still love the car and hope they get this brake issue
solved .
Old 01-21-2019, 07:15 PM
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Don't get me wrong.
I still think for the money W205 offers a lot of stuff.
Design in and out is great.
A most comfortable ride in the class with the best space in the class too.
However, reliability wise... it is worse than VW products... lmao
Old 01-22-2019, 11:03 AM
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Just heard from MB , they are replacing my brake booster also.. Sounds like a lot of folks have had the same issue .
Old 01-22-2019, 03:07 PM
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Originally Posted by RichNY
Just heard from MB , they are replacing my brake booster also.. Sounds like a lot of folks have had the same issue .
is your replacement due to the 'hissing' sound when letting go of the brake pedal?
thanks
Old 01-22-2019, 03:14 PM
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Yes
Old 01-22-2019, 03:19 PM
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Originally Posted by RichNY
Yes
funny that MB thought little hissing is OK but mine is just a tad louder so they said they will replace it so well see what they do..

but im surprised that they have to be told what to replace in order for them to actually do it..like if I was like "ok that noise is fine' they wouldn't even replace it..

I still have that crackling, rattle sound from the above compartment where the sunroof buttons are and where you put your sunglasses, and they said they tightened the harness up there with some tape but yet its still like that
Old 01-22-2019, 03:26 PM
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Funny I hear something to up there and I think it’s the seal around the roof because when I crack it open I don’t hear it .
Old 01-22-2019, 05:29 PM
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So I reached out to MB corporate to complain about the many issues this cpo had in a little over a year owning it, I was told that a executive referral manager will contact me...I would not mind getting into a 2019 lease if they take this back , but for the record the dealer does correct each issue under warranty that does come up ...
Old 01-22-2019, 05:49 PM
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Originally Posted by RichNY
So I reached out to MB corporate to complain about the many issues this cpo had in a little over a year owning it, I was told that a executive referral manager will contact me...I would not mind getting into a 2019 lease if they take this back , but for the record the dealer does correct each issue under warranty that does come up ...
yes but if they haven't had that issue before then they wont do anything since they wont get paid but MB Canada or USA for their work lol, so we are test dummys
Old 01-23-2019, 10:05 AM
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Originally Posted by RichNY
Funny I hear something to up there and I think it’s the seal around the roof because when I crack it open I don’t hear it .
are you taking yours in to have them check that out?
Old 01-23-2019, 10:06 AM
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No not at this time
Old 01-23-2019, 10:07 AM
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Originally Posted by RichNY
No not at this time
I wonder if ELW would cover this seal if infact it is that issue
Old 01-23-2019, 09:25 PM
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Got my car back today , brakes work great with no hissing but what I find strange is that the car feels like it runs better or smoother and accelerating better . Could the booster be related to this or is it just my imagination lol
Old 01-24-2019, 12:52 PM
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Originally Posted by RichNY
Got my car back today , brakes work great with no hissing but what I find strange is that the car feels like it runs better or smoother and accelerating better . Could the booster be related to this or is it just my imagination lol
its funny you mention this because my c400 feels soo heavy and seems like doesn't have that jump from get go like a c300 loaner I got..maybe cuz I have 19" winter studded run flat tires? but the 2018 c300 loaner I got had Pirelli run flats on them I dunno if it was winter tires or all season, but the reason for my comment is my brakes make that hissing noise and MB has ordered the brake booster replacement part so ill see once mine is replaced and my car has that extra jump to it in terms of acceleration
Old 01-24-2019, 01:03 PM
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Let us know ,
Old 03-05-2019, 11:56 AM
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Originally Posted by RichNY
Let us know ,
so after having my brake booster replaced, the car feels like it has more of a jump!
Old 03-05-2019, 11:58 AM
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Originally Posted by RichNY
Got my car back today , brakes work great with no hissing but what I find strange is that the car feels like it runs better or smoother and accelerating better . Could the booster be related to this or is it just my imagination lol
haha no it isn't your imagination, its funny cuz I read your comment and was waiting to see if mine was same and it does feel like it accelerates better, has a jump right off start and brake pedal is smoother and software where I don't have to push as hard to brake..
Old 03-08-2019, 02:32 PM
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C400
Would any of you be able to post up / refer to a specific MB service note for the brake booster that I can forward on to my dealership?
Old 03-11-2019, 06:49 PM
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I can't find mine otherwise I would post it but I don't understand why dealer is giving you problems. There shouldn't be any hissing noise coming from pressing the brake pedal, that's it. When i took my car in, they were like yeah that noise is the break booster. Easiest warranty repair ever...
Old 03-12-2019, 01:26 PM
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Red face

Originally Posted by BareQs
i don’t think they can hear us, I asked this exact question
ya I don't know the part number either on mine, but they shouldn't need a part number just tell them the brake booster needs to be changed. they may push you around like they did with me 1 or 2 times but they will replace it the third time you complain about it

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