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Hi,
Brake Squealing is NOT usually an indication of Pad Wear, it's more a case of Pad Glazing or Hanging Caliper. When the Pads have worn very thin, there can be insufficient Mass to avoid a resonent vibration, but your Wear Indicator would most likely come on before this.
Brakes will make a grinding noise when the Pad Material is all worn away, add to this that your Brake Wear Indicator Light will come on well before this also.
By removing a Wheel, you can sight through the Caliper and see how much Friction Material remains on the Pads.
Try making several Medium Hard Stops from 60-80MPH down to 50MPH without Locking the Brakes. Allow 300-400 Yards between Stops and see if this doesn't clear up the issue.
If not, and you have sufficient Friction Material left, pull the Pads and Champfer the edges of the Pad Material 45° with a File. This will allow the Pads to reseat themselves evenly against the Discs. Also, take some 40 Grit Sandpaper using a Square block of wood and rough up both the Pads and the Discs to remove any Glazing which may have occured. Hope this helps...
Happy Motoring!... Jim'99
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