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The original Jag defined the location of the LCA bracket with the subframe, not the casting. The differential was shimmed to fit inside the brackets. Longitudinal braking forces (translated into lateral and shear forces at the brackets) were taken by the subframe, not the casting. Reactions from the rotor/caliper were distributed between the top and bottom casting mounts.
In short, the top and bottom bolts were there to locate the differential in the
subframe. Of course, you must always regard the dif casting and subframe as a system, with each complementing each other.
Braking forces on the rear are considerably smaller than the motive forces from a big engine. Remember that on decelleration, weight is translated to the front, leaving only about 30% under maximum braking. Conversely, under accelleration weight goes to the back, possibly ending up with 90+% there, depending on the stickiness of the rear tires.
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