the orange stuff (aka natural loctite) is holding it to the bracket. Such corrossion is best dealt with either kroil or acetone+atf mix.

The mix is really really good stuff, A little heat helps too (ensure you dont use heat with the mix is near)

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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)