Interesting marks on brake discs

[Sailor]

The front brakes on our Lude judder, if only slightly and occasionally. The discs feel a lot smoother than they look in these pictures, and have enough meat on them; and there's plenty of pad left.
However, I did notice some radial markings. They're not scratches or cracks - in fact, you can't feel them even though you can see them.

Any ideas?

[Doggo]

I don't know. Sometimes I feel like jacking it all in, moving to Peru and farming llamas.

[Doggo]

But if you mean the discs, the marks might have been put there by a very small and slightly stupid alien intelligence?

Just a thought. I'm not saying it's right.

[Doggo]

Maybe a manufacturing Quirk? A ridge from when they were forged or cast, which though machined off is in the grain of the metal and is showing through?

Edit: Good luck with it anyway.

[vetrox]

The first pic just looks like the remnants of a brake that seized on. If it judders then the discs are warped and need replacing

[ek9sid]

I've seen this plenty of times. Always put it down to residue from the brake pads

[wurlycorner]

Yep, normally residue from the edge of where the pad friction material has been sat after you've parked up with the brakes really hot.
Those particular marks should disappear after a short time (though you might get others that replace them )
If not, it does suggest a manufacturing problem in the disc.

[RattyMcClelland]

Discs don't warp. People just seem to diagnose that as an issue for reasons I can't understand.
It's uneven pad material distribution.
That looks like pad material for hot braking and holding the brakes at a standstill for extended periods of time like traffic lights.

[Sailor]

Food for thought. Thanks.

I don't recall getting the brakes particularly hot and I always use my handbrake at traffic lights.
However, a couple of replies on the ATR forum agree with the pad material theory. One respondent even provided a useful link: http://www.essexparts.com/learning-cent ... ost/Bed-in

Perhaps I should try a bit of emery paper?

[Doggo]

I agree that nail care is important, but you really ought to focus on the problem.

Sorry. I'll shut up now.
Again, hope you get her sorted relatively cheaply.