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Uneven wear on rotors

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Old 12-13-14, 02:49 AM
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Uneven wear on rotors

Hi all

I just got my rotors skimmed (off vehicle) and fitted new pads front (DS2500) and rear (EBS yellow).
I cleaned the faces of the brake, rotor and wheels so there was no rust etc so they can seat perfectly. I lubed the slider pins with caliper grease (as well as between pads and shims etc). Also torqued lug nuts properly.

I did my best to bed them in a few days ago - a casual drive, then 15 reasonably strong operations within reasonably quick succession, then cool for 5 mins.
The surfaces looked to have even wear after that.
Just went for another decent drive with harder braking, can see both front rotors now show more wear (or at least appear a different colour) on the inner of the rotor as attached.

Seems like I have done all the right things so any ideas?
Wasn't like this with the previous pads/before rotors skimmed.

My only other consideration is that maybe the front pads haven't actually fully bedded yet....

Cheers
Attached Thumbnails Uneven wear on rotors-20141213_212032.jpg  
Old 12-13-14, 08:20 AM
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Either the shop that turned the rotors didn't get them totally flat or your pad isn't totally flat. That's the only explanation I can think of for that.

Eventually the pads will match the profile of the rotor, but that kind of sucks.

Looks like you had larger brakes at one point, the brake dust shield is for a larger rotor?

Dale
Old 12-14-14, 05:15 PM
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That or a piston is sticking. See if it evens out.
Old 12-15-14, 09:48 AM
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Or you're torqueing your wheels using a impact wrench....
Old 12-15-14, 11:58 AM
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Originally Posted by tt7hvn
Or you're torqueing your wheels using a impact wrench....
How/why would that effect rotor wear?
Old 12-15-14, 12:21 PM
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Uneven/overtorqued lug nuts can cause the rotors to sit unevenly. A sticking piston in a multi-piston caliper will cause the brake pad to apply uneven pressure to the rotor.
Old 12-15-14, 12:44 PM
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If you have just driven it twice don't worry about it yet. Get a few more miles on it and it will probably even out. If not you have a sticking piston.
Old 12-15-14, 01:38 PM
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Haha I used a torque wrench - thought I made that obvious. After more sedate drive they are all even so I think it might just be heat related. Will see with time...
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