I have 2017 cascadia model and tractor brake lights acting. When I release brake pedal stop lights stay on. If the truck is not running and trailer not connected -same thing lights are acting. I checked fuses , all good. I went to dealership they could not find problem...I read online that this might be upcoming recall. Perhaps ahybody had this problem and knows what was replaced to fix it?
A Bad foot valve can make brake light stay on, you need a crack a brake line to make sure air is not still in system when brake lights stay on?
Its look like this part of recall https://thebrakereport.com/brake-light-prompts-freightliner-recall/
Its little pressure switch with 3 wires plug located on the right side by brake pedal on the manifold. $25 part.
I am running a 2019, my brake lights would be stuck on sometimes for a few seconds too long sometimes 10 minutes, seemed random. Took that switch out and here's what it looked like vs a new one. What a crap design to have to replace this on a year old truck