Quote:
Originally Posted by Arctic
Hi Mike.
My MGZT had the very same corrosion of the OS rear back plate which in turn eventually damages the bearing & or the sensor, its very funny though 9 time out of 10 its always the OS 
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A friend of mine who worked as a Service engineer at Girling many years ago explained that the rear OS ( RH) disc got all the muck as it was thrown up off the LH front wheel , in a bow wave V formation onto it, when running through puddles etc which were most often lying in the gutter.