Buzzing sound in engine bay

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TommysBenz2003

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May 13, 2013
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Hi all. I have a 2003 E200k W211. Sometimes when I open my car by remote or when im driving or sometimes stationary, I can hear a buzzing noise that sounds like a pump running that results when im sitting in the car in me feeling a vibration through my brake pedal!!!
I have no loss of brake pressure or ability and no warning or error lights! I've read online that this may have been normal for w211's between 2003 - 2005 as they used a type of SBC braking system?!?!?
Can anyone please confirm or disprove this as its doing my nut in not knowing if its normal or not !!!!

Many thanks
 
It's the sbc pump
 
I know it's a bit strange. But it's normal
 

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