Can't say I've ever seen this before

[azerik]

Dealer has replaced the pads and turned all rotors about 250 to 400 miles ago. Today i was once again spending quality time with my Steeda Front bar and when I pulled the tire off I found this.

The caliper is 'stained' because of the iron remover I used a few weeks back, this is understandable. As for the rotor though, I've never seen that scalloped on the rotor face before. Looking a little closer it also appears it was dropped (ding in the top in the vents). Though the brakes work fine and no longer pulse like ABS freaking out.

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[kennethjk]

That would account for all the orange colored rust stains on my garage floor

 

[HuntingPudel]

The “ding” in the vents is material that was removed to balance the rotor. Not sure about the ripple effect on the rotor unless it’s due to ABS pulsation. ?‍?

 

[Mach-Lee]

How does the other side look? That pattern almost looks like like lathe chatter from setting the feed rate too high on the lathe machine. The surface finish also looks too rough, not sure if was like that off the machine or if that happened from hard braking? Were you doing any real hard braking since they were turned? Stock pads?

I suspect a poor quality turning job that lacked a proper finishing pass. Surface is too bright so you don't have a very good pad material layer established.

Might be worth having them looked at by a machine shop. My local parts store will turn rotors for $25/ea and they do a good job.

Flat spots on the edge are normal for balancing.

 

[azerik]

It looks like pad material in low spots maybe. I'll try to get a shot from the back side but I assume that's going to be hard to do.

No hard braking and no shudder from the blending.

 

[Mach-Lee]

It looks like pad material in low spots maybe. I'll try to get a shot from the back side but I assume that's going to be hard to do.

No hard braking and no shudder from the blending.

Pad material filling in the low spots from lathe chatter would make sense. That's going to be too high of frequency to feel in the pedal (pad will ride over all the peaks), but it will affect the pad friction since the effective contact surface area is reduced.

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