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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  
I just had my booster replaced under warranty for the exact same issue. I had to make a video to finally get them to take action. They initially tried telling me it was normal and even brought out another customer’s car to show me the same noise. Regardless, a luxury vehicle should not be making those kinds of sounds. Now, with the new booster installed, I don’t hear a thing.