View Single Post
      10-02-2012, 11:04 PM   #14
Frosty
Lieutenant Colonel
 
Frosty's Avatar
 
Drives: Ordered my E92 (7/10/06)
Join Date: May 2006
Location: Northern NJ

Posts: 1,907
iTrader: (0)

Quote:
Originally Posted by The HACK View Post
BMW rotors use a very low carbon cast grey iron and are NOTORIOUSLY soft, and typically will wear below minimum thickness before the 2nd set of pads.

As to the OP's initial question about how long these rotors should last, there's no good answer, to be honest. If you drive 55mph, never go over 2,500 RPM, brake like you're afraid the brake pedal is going to bite you back...Let's just say I've seen factory rotors that have lasted over 100,000 miles before. Then again, if you're living life one traffic light at a time, DRAGS your left foot on the brake while you accelerate with the right? Those rotors will likely be done by 30,000 miles. Or if you go to about a dozen local high performance driving events at very brake demanding tracks like Auto Club Speedway, where you're slowing down from 125mph to 40mph repeatedly every 2 minutes, 10-12 times in a row? Don't expect it to last more than 20,000 miles.

So you see, it's all subjective to your driving style. I can tell you on AVERAGE they last anywhere between 1-2 pads per rotor, but more aggressive driving will shorten that timeframe dramatically, depending on what sort of brake compounds you're using.

great post ~Frost
__________________
.................................................. ....................
335i Coupe (6MT) (2007: 9/06 build, pre ordered, only owner): Space Grey / Black Leatherette / Grey Poplar trim / ZCW / ZSP / BMW assist w/ bluetooth / power rear shade / navi with iDrive / comfort access keyless entry /+homelink mirror/ 154,885+miles (Nov-12-2013)
.................................................. ......................
Frosty is offline  
0
Reply With Quote