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It's power steering oil, likely.
Usually the when the belt goes for a dump it winds itself around the pulley/pump shaft and tears up the front seal on the pump.
This is likely where your buzzing is coming from in the brake pedal, due to lack of power steering oil.
Hope this helps. And the pump isn't a treat to change, sorry.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.