If there was a failure in the servo assembly, unplugging the servo should remove the load from the wire delivering power to the servo's clutch circuit via the brake pressure switch.
Unless the cooking of that harness-end has allowed the power feed wire to come in contact with another circuit in the plug.
One thing you could try is to snip that wire from the pressure switch to the servo plug, right near the servo plug, but far enough back into the harness where the wire insulation is still good. Tape the harness-end of the cut wire, and take it for a drive.
'94 Bronco XLT 5.8L E4OD Tow Pkg., Quad front shocks.
'97 F-150 Lariat SuperCab LongBed 4.6L 4R70W Tow Pkg.
2010 Escape XLT 2.5L, 6-speed Auto, FWD.