Nightmare. Hissing sound from under yr feet when pressing the brake pedal The brake pedal can go stiff and braking is hard work and a juddering

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Rambosouthlondon

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Joined
Aug 30, 2023
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13
Location
London
Car
C220 diesel 2019
W205 c220 2019. Hissing when pressing the brake pedal the brake pedal can go hard and normal when out on a drive juddering on the disc with the pedal pressed hard in slow traffic. I readitcould be the vacum booster would this be a hard. Change. Cheers for any advice
 
It's not a 5 minute job that's for sure. Don't know exactly on your model but generally they are a bit fiddly to get out and replace. It does sound like that is your problem. I think I would find a used one as it is not a common problem.
 
It’s a c220 w205 2019 Iam shocked it causes the brakes to fail or harden the pedal without any warning I fill like trying my
Luck at the Merc dealership Laing a complaint on heavy as it’s only for 4 yr old car
 
I fill like trying my
Luck at the Merc dealership Laing a complaint on heavy as it’s only for 4 yr old car
If the car has a complete MB service history it's certainly worth approaching them for a goodwill claim. Be prepared to stump up for a "diagnostics fee" first though.
 
We go there today
 

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Correct picture sorry
 

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Correct picture sorry
Vacuum in the brake booster is too low....no sh!t sherlock. Could have worked that out from the symptoms....but what is causing the vacuum to be too low - is that another diagnostic fee? A tech might actually take a look at the brake booster.........
 

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