If the brakes are squealing, there's a good chance it is the brake pad wear sensor. A new design was implemented in January 2006 and can be identified by its green color.
Car Problem Reports
BMW 645Ci New Brake Pad Wear Sensor Design Will Prevent Squealing
BMW 645Ci Problem
6 Reports
Model Years Affected: 2004, 2005
Average Mileage: 50,250 mi (30,000 mi - 72,000 mi)
Verified
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Visitor, 2004 BMW 645Ci, 72,000 mi
brakes squealing. very annoying
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