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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > must change rotors with break pads?



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      01-15-2012, 07:01 PM   #1
colt9987
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must change rotors with break pads?

I need new rear break pads and I was told I need to replace the rotors as well...is this true? Or can I get by with just replacing the pads and new break sensor? Also, where can I buy the break sensor needed? Sorry never have messed with the breaks on this car before.
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      01-15-2012, 10:17 PM   #2
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The rotors depends on the thickness of them, i forget the minimum recommended thickness.

www.getbmwparts.com is a great site for oem parts
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      01-16-2012, 09:57 AM   #3
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what is the best way to tell the thickness of my rotors?
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      01-16-2012, 04:02 PM   #4
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micrometer
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      01-17-2012, 02:18 PM   #5
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Quote:
Originally Posted by BKV122 View Post
micrometer
ok and what are the measurements where I would want to change my rotors? what measurements would they be ok to leave on and just change pads?
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      01-18-2012, 10:39 AM   #6
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Quote:
Originally Posted by colt9987 View Post
Sorry never have messed with the breaks on this car before.
Obviously never learned to spell brakes, either.
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      01-18-2012, 06:22 PM   #7
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BMW recommends generally a rotor change but not always necessary. Minimum thickness is indicated on the rotor hat. Here is a link for reference:

http://www.e90post.com/forums/showthread.php?t=546064

If not replacing the rotor, a light cut on a lath to remove any lip can help. You can also add a small chamfer to the friction material at top and bottom of the pad to clear the lip until fully bedded if rotor surface is otherwise in good condition. Best solution is to get new pads and smooth/flat rotor surface
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      01-19-2012, 08:56 PM   #8
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i know this is a car forum and not an english class, but seriously man... it's "brakes" and not "breaks".
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      01-19-2012, 09:34 PM   #9
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i say change everything that way there no pull coming from the rotors later on, ecs tuning sells a package with sensor, rotor and pads
http://www.ecstuning.com/BMW-E90-335...All/ES2083397/
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