Ive always been told its called a tone wheel. Ive done this cleanup on my car front wheels when it illuminated the ABS lamp.

I was set to do wheel bearings in the next week - so it was a in place job.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)