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      03-31-2015, 01:25 PM   #317
AlexPS
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Drives: 2011 E92 M3, 2011 X6 3.5
Join Date: Dec 2009
Location: San Diego, CA

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The cowbell issue is back on mine. It made an appearance last year for a brief period, then nothing until now.

I am doubtful it's caused by a pebble stuck in the brake shield. The noise is loud and sounds like something hits a hollow pipe—too loud to be a small rock in the brake shield. Sounds like a ricochet of a small metal piece inside a hollow metal container—but it stops as soon as the car is not rolling. Sounds like it comes from the center rear area underneath the car. I am wondering though, if this issue has something to do with mufflers being replaced (I have MPE).

I remember this time it was triggered when I made a sharp right turn. It's more offensive when the car is cold, and seems more possible to replicate by backing up at a downward angle (like backing out of a driveway, down to the street).

I'm hoping I can show it to my SA and the shop foreman and see what they think.
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