View Single Post
      04-11-2012, 06:29 PM   #12
AndreyT
Captain
AndreyT's Avatar
United_States
20
Rep
970
Posts

Drives: 2011 335i Sedan, Sport
Join Date: Feb 2011
Location: Northern California

iTrader: (0)

Quote:
Originally Posted by tk9 View Post
buzzing/humming sound when driving over imperfections
So, what kind of sound is it? Like an electric pump working? Or like something loose is vibrating?

In some cars driving over road imperfections under braking results in quick activation of ABS, which is immediately followed by a buzzing sound from ABS motor restoring the pressure in the system.