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RE: floating(?) brake rotor



  does this term refer to the 'sliding caliper' design found
  on the M5?  also previously seen on a mid-80s 535i?
  with this rotor, there's 1 piston that pushes the pad on that
  side while drawing the opposing pad/caliper half toward it.

  BMW used an ATE caliper on the 1975 R90S motorcycle that
  allowed the caliper to pivot L/R ('hinged' at the rear) -
  I thought *that* was considered a 'floating' caliper...