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My PCCB's have these fibers as well. Mine look light gray to the naked eye but under a flash can look white in a photo. Just took a photo with flash on to test the theory. What you don't want to see are any hairline cracks from one hole toward an adjacent hole. Yours look fine to me.
My PCCB's have these fibers as well. Mine look light gray to the naked eye but under a flash can look white in a photo. Just took a photo with flash on to test the theory. What you don't want to see are any hairline cracks from one hole toward an adjacent hole. Yours look fine to me.
Very normal wear... Consider what the rotors and pads are maufactured from, carbon fibers and phenolic resin....which makes sense why you would see white streaks.
Although, as the previous RLer posted, watch for cracks between the vent holes.
As you may already know, these rotors can be damaged by an errand rock or knuckle head changing a tire. Extra care should be given when the wheel is being removed/replaced... $$$$$$.
Here's a pic of my left rear rotor, white streaks and all... JB