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      11-06-2011, 10:57 PM   #71
davem3fan
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Drives: 2013 E70 X5d Swiss Army Knife
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Quote:
Originally Posted by lve2xlr8 View Post
There is another noise that typically happens within the first couple minutes that sounds like it's coming from the front driver's side fender. It's almost sounds like a power mirror motor but is only on for about 5 seconds, what is this?
I believe this one is the brake booster using a pump to
pressurize the brake system fluid in the lines.

There is a noticeable correlation between front brake pad wear/thickness and how long that pump operates on startup.
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