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Hissing noise from brake pedal when released - Mercedes GLC 300 AMG premium plus (2020 Model)

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16K views 15 replies 9 participants last post by  mrrosado  
Hi all ,

I have a encountered a problem recently with my GLC 300 which was purchased new in 2020.
A problem developed that when releasing the brake pedal, a hissing noise comes from the brake pedal - similar to a vacuum leak sort of. The noise is very annoying.
I have taken the car to a Mercedes service centre back in November last year; they checked and said nothing is wrong with the car. I was bit annoyed as clearly something is not right either. This service centre is not my usual dealer; I had to go there, as no appointments were available at my usual Mercedes dealer.
Has anyone experienced this? Car is still under warranty; I am planning to take to mu usual dealer next week along with the service.
Searching the web, I can see few posts regarding this.

Any details on this is much appreciated!
Have the same issue GLC 300 2018. It happens after about 15 mins of driving and only when warm/above 70 F outside.
Went to dealer twice, they didn't find anything wrong.