You're welcome, MB recommends against turning, but if you're within specs, I don't see an issue.

I would think on the front simply replacing with new is the way to go, due to the time consuming bearing hassle.

If it's close to minimum, then wears below that and the pads wear down below their limit, your caliper piston may push completely out of the caliper resulting in no brakes on that axle.

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83 SD

84 CD