To me it looks like brake pad material on your rotors due to your street pads melting. Slap a new set a cheap pads on there from Autozone or something and drive it for a week or two that material should come off. As long as you don’t have vibration while braking they should still be good. Just make sure to use track pads next time. I personally run StopTech 309 pads because they’re good on track and street
I got Stoptech Sport pads that I've used on track and street for many years.
Brembo, bosh and a few others mentioned in another comment are all really good too.
I got the Bosche pads. I think they were in a higher category than daily but the front+back together ended up being cheaper then other brands I was looking at. Just make sure you get ones clearly labeled front or back, and Japan built.
I got BREMBO rotors and Bosch quiet cast pads, happy with the purchase.
I run StopTech Sport pads on my E92 M3 and they hold up very well for a dual duty pad. I prefer them over the other options listed.
I was very happy with Bosch BP621 brake pads. It had excellent grip.
Look on rockauto, and look for the brand called bosch, they kick ass and are oem quality
Bosch pads are fine. Trouble is when you buy from Amazon you don't know if you're getting Bosch or counterfeit Bosch and there's a real risk of counterfeits from Amazon.
For my (owned 3 years, purchased used) 2014 Honda Crosstour I've always had to grind down the edges of the pad mounting plate tabs on Bosch brakes a couple of mm to get it to fit into the calipers. I have just received a new set, and while I still had to grind down the edges to get them to slide into the calipers, the top and bottom edges were MUCH shorter than the previous pads. So much so that when braking after reversing direction, the pads will shift in the calipers with a noticeable 'click' as the brake pads engage the disks to slow the car and are thus moved to the other end of the caliper. The overlap between the brake pad plate and the 'C' in the caliper where the tab meets the caliper is only 2mm or so. Definitely less than I am comfortable with.
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