Brake rotor damage does it need replacing?

[RDee]

Hi,
I spotted marks on the inside of the cooling vents (?) on my front rotor, see photos. Do they need replacing and any suggestions what the likely cause would have been?

The marks appear on most vents. If it is important/useful it is a road bike with ultegra hydraulic disc brakes which are about 4 years old and have done around 22,000km in all weather commuting. Also for what it’s worth the rear rotor appears to be fine.


Thanks in advance 👍

 

[raleighnut]

That's just muck/worn off pad material give it a good clean with 'brake cleaner'

 

[RDee]

That's just muck/worn off pad material give it a good clean with 'brake cleaner'

Great, thanks I will give it a good clean tonight 👍

 

[Cycleops]

Not just muck. There's a huge chunk out of it. You could keep on using it but your pad life won't be great. New rotor for sure. They're not expensive.

 

[fossyant]

Give it a good clean and double check. Aren't Ultegra disks a laminate sandwich rather than solid ? Potentially worn thin ?

I suspect that pitting could quickly damage your pads. 22,000 of commuting. They have probably done their job.

 

[Kbrook]

There’s a bloody great chunk missing, a new rotor is about £10 , throw it away

 

[Espresso vecchio]

There’s a bloody great chunk missing, a new rotor is about £10 , throw it away

The tiny pitting around the vents is unremarkable. Are Kbrook and Cycleops really thinking that the shallow asymmetrical V on the outer edge is a bloody great chunk missing? It's a normal feature of the rotor's rim!

 

[Cycleops]

You see, I'm not familiar with the upper eschellons and ratified air of Shimano's group sets so think I can be excused

 

[wafter]

It looks superficial, but I'd be intrigued to know what the cause is. Looks like corrosion but I thought these bits were stainless...?

Sounds like impressive mileage given the conditions; probably worth checking thickness against manufactuers' stated minimum