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E82 / E88 1 Series (2008 - 2013)
BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by either an inline 6 in the 128 or the twin turbo rocket sled 135.

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  #1  
Old 09-10-2011, 08:55 AM
JejuneLegume JejuneLegume is offline
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Location: Atlanta, GA
 
Join Date: Sep 2011
Posts: 23
Mein Auto: 135i MSport
Exclamation All four rotors warped after a few thousand miles

After a few thousand miles began experiencing vibrations when braking.

According to the dealer all four rotors needed replacement because they were warped (the rotors).

Not real confidence inspiring.

I went ahead and replaced the front rotors with drilled-slotted rotors. If those hold up for more than a few thousand miles, will probably upgrade the rear rotors also.
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  #2  
Old 09-10-2011, 09:27 AM
bmw_n00b13's Avatar
bmw_n00b13 bmw_n00b13 is offline
Freude am Fahren
Location: Cambridge, ON
 
Join Date: Feb 2008
Posts: 6,372
Mein Auto: 99 528iA
Brake rotors almost never warp: https://www.bimmerfest.com/forums/sh...3&postcount=17

Drilled rotors are, with modern pad composition, not much more than aesthetic improvements. The original idea behind it was to allow off-gassing from the brake pads to escape, back in the 60s. Modern brakes really don't off-gas that much. Slotted are roughly the same story: http://www.8thcivic.com/forums/suspension-brakes/92039-cross-drilled-rotor-myths-dissolved.html
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
Breaking My Wallet since 2009
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Last edited by bmw_n00b13; 09-10-2011 at 09:32 AM.
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Old 09-10-2011, 01:25 PM
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rpsz4 rpsz4 is offline
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Location: Pace, Fl
 
Join Date: Jun 2009
Posts: 180
Mein Auto: 2008 135i
I have personally found that if you tighten the lugs to correct spec. with a hand torque wrench, the rotors will not warp. If some jackleg uses an air impact gun with a torque stick, they will warp. No matter how good they claim the torque stick is, they can not guarantee that each lug nut receives the same NM.
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