Hello,
That is the hydraulic control assembly for the ABS system.
It is likely just surface corrosion.
If you would upload a close-up picture of the item so we can see the extent of the corrosion.
That module does not get replaced unless there is an issue with the ABS system, or it is leaking fluid.
I have attached diagrams below for your reference.
Let me know of any questions.
Thank you.
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Tuesday, May 31st, 2022 AT 9:34 AM