View Single Post
      11-06-2011, 10:57 PM   #71
davem3fan
Captain
davem3fan's Avatar
United_States
43
Rep
664
Posts

Drives: 13 E70 X5d
Join Date: Apr 2007
Location: Philly Metro

iTrader: (2)

Garage List
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.
__________________

Dave Flogaus CCA #123862
16 F80 M3 Daytona Violet
95 E34 M5 Daytona Violet
13 E70 X5d Tow Buddy