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Re: Brake Dust on Wheels?
It looks to me like there's a shadow on the inside edge of that where it starts. That would seem to me as of the paint/powder coating is gone.
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Re: Brake Dust on Wheels?
Are these OEM or after market wheels and how old?
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Re: Brake Dust on Wheels?
Looks to me like the paint has failed for some reason. It is possible that the failed paint was caused by something that was applied to the wheels but more than likely there was some contaminant on the wheels before they were painted.
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Re: Brake Dust on Wheels?
Just curious, is it in the “cast off” trajectory of the vents in the rotors?
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Re: Brake Dust on Wheels?
Originally Posted by oneheadlite
Just curious, is it in the “cast off” trajectory of the vents in the rotors?
You thinking they got "sandblasted"?
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Re: Brake Dust on Wheels?
Originally Posted by chilly
You thinking they got "sandblasted"?
That’s kinda my thought - either from road debris forwarded to the rotors by brake ducting / general air routing, or hot pad material cast off under hard braking.
Under hard braking at night my E36 M3 with aggressive pads would cast a shower of sparks past the windows. (I don’t think any coating would be impervious to hot castoff like that).
In todays age of wanting top tier braking performance with no noise, who knows what sort of concoction the pads are; you might not get aggressive iron remover reaction even if it is pad material. My theory goes mostly out the window though if he’s in no way out hooning.
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Re: Brake Dust on Wheels?
Due to the position of the damage on the outer/outside lip of the wheels I can't see how it would be from anything cast off of the rotors. The centrifugal forces would cast anything off of the rotors either into the wheel well or depending on what degree the wheel was turned out between the wheel well and the tire.
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Re: Brake Dust on Wheels?
Originally Posted by BLM
Due to the position of the damage on the outer/outside lip of the wheels I can't see how it would be from anything cast off of the rotors. The centrifugal forces would cast anything off of the rotors either into the wheel well or depending on what degree the wheel was turned out between the wheel well and the tire.
Um...huh? The rotors are inside the wheel, so anything cast off by the rotors...is going to be inside the wheel, not the wheel well, no matter how the wheel is turned.
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Re: Brake Dust on Wheels?
Ok, some updates after I passed on the theory of paint failure. The wheels are aftermarket from LMR, less than a year old with 10,000 miles on them.
After further investigation, this is not paint failure and definitely something on the surface of the wheel. He has managed to remove the majority of it using a cocktail of chemicals, but has introduced some marring. As you can see from these pics, the material is on the ledge of the spokes.
I'm now suspecting this is from superheated pad material that has fused to the wheels during a track day. The condition of the rotors would indicate this too.
Many thanks for the replies, it has had me stumped.
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