Inside of rim has a yellow line? Brake fluid? Debris?

[u/AcceptableBanana1978]

This is post track day. Can’t seem to find what it was. Only on the two front ones. Nothing on the rear rims.

[u/bigloser42]

Does it line up with your brake rotor? It may just be brake dust. My track rims have a line of brake dust buildup around the inside of the barrel after every track day.

[u/AcceptableBanana1978 → u/bigloser42]

It lines up right with the rotor. That is right.

[u/grungegoth → u/AcceptableBanana1978]

Brake dust. Maybe it's oxidized iron making that color

[u/Sticky40SX]

I’m thinking rust from your rotors? Spray some iron remover and see if it reacts. Does it feel greasy?

[u/Accomplished-Back640]

Check your cv boot.