This actually sound like a compound problem involving both the brake controller and the one brake with the higher temperature.
On the mechanical side, it sounds like a maladjustment on the brake pad clearance in that the clearance was closer than the other three brakes.
Add to that a minor fault of slightly higher leakage current from the brake controller that provided just enough overall power to the brake circuit to move all brakes a millimeter or two. Just enough for that one brake to make contact and increase drag.
Just my thoughts, YMMV, glad to hear that the problem was resolved.
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Bill & Anne, Athena (cat), Jada (pup), and Cupcake (cat)
Retired Navy CPO, Vollie Firefighter and Industrial Maintenance Specialist
Wilson III: 2015 Ram Tradesman 2500 6.4l CC 4x4 SB
the gypsy, Belle III: 2018 Sprinter Limited 3531 FWDEN
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