W211 Whirring noise after braking

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KillerHERTZ

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Had a drive in my Dad's 2003 W211 E240 and I noticed that after I had applied the brakes I could hear a whirring/vibrating noise coming from the engine bay area + I could feel it through the brake pedal.

It happens when I have the brakes on, and also when I have taken my foot off.

The best way to describe it, is the sound of a my (W202s) wingmirrors folding in, but quieter.

Any ideas?
 
SBC I suspect and quite normal if it is.

Olly, does the modified larger bore pipe make things much quieter, in your experience ?

Mine is quite noisy. It has been reliably checked & is perfectly serviceable.

Splitpin
 

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