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

16K views 15 replies 9 participants last post by  mrrosado  
Hi I am also experiencing the same hissing noise on my 2020 glc 300 and the mechanics at the merc dealer are saying nothing is wrong. The sound is extremely annoying. Has anyone found that replacing the break booster fixed the problem? Really appreciate any advice