| 02-01-2023, 01:25 PM | #1 |
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Private
 
71
Rep 79
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Rust ring on rear rotors?
Just noticed that both rear rotors of my 540i has a rust ring formed. Never seen this before, is this something covered under new car warranty? I feel like it’s caused by insufficient contact between pads and rotors, but I could be wrong.
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| 02-01-2023, 02:02 PM | #2 |
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Colonel
 
714
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Drives: 06 330i E90, 18 530xe G30
Join Date: Dec 2010
Location: Toronto
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I wouldn't worry about this too much, most likely cause by a small hard spot on the rotor or a a small defect on the pad. I bet if you did a few high speed hard braking sessions you could get that line removed. I'd be surprised if they replaced these rotors under warranty.
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| 02-07-2023, 05:07 PM | #4 |
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First Lieutenant
 112
Rep 384
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Drives: 16 X3 28d/18 540d xdrive
Join Date: Jun 2017
Location: Western PA
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You call that "rust". Try living in the Northeast where the roads are white with road salt. Rust is really everywhere on the braking system. In fact, it's so bad that brake pads experience rust jacking. A term used when brake pads become so corroded that it the fiction material separates from the steel backer plate.
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