Quote:
Originally Posted by BeamerandBimmer
I've heard a "fairly loud" buzz on occasion at start up. It does not sound like the SMG/DCT pump that primes when you unlock a car with those transmissions. It is also not fuel pump priming. Today I got in the car and left the door open as I put one foot on the brake, lo and behold...... I heard the sound as I felt the brake pedal move slightly under my foot. Could be brake booster.
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This (brake booster) seems plausible to me. It happens only pre-startup - maybe it happens after start but cant decern it with the motor running. I'm going to see if putting my foot on the pedal will induce it... with video rolling. :-)