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There have been several threads that eluded to the rear on the xdrive wagons being more of a direct bolt on for the 135 brake upgrade as far as getting the emergency brake working. That functionality is key for any such upgrade for me.
However, that is part of my problem, I can not confirm this and comments in other forms such as " your golden if you have an Xdrive wagon" do little to explain the difference and whether or not it is that simple. I've read that its more about the rear rotor assembly than anything else but that is what I am trying to find out.
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