Modern era cars can be difficult to sort out when it comes to electrical glitches. I have no schematic for this vehicle so I can only offer a few bits of advice.
One is that seeing as how the brake light switch is powered all the time it could be that the short lies in some other area that is also powered up constantly; the hazard switch, cigarette lighter, etc.
Two is that you might consider the purchase of a Helm electrical manual for the vehicle. These are used by Ford dealers and can often be found on the cheap on eBay.
The electrical manual alone is not the answer to every problem but it does lay all the wiring out in a simple, easy to use format with color codes, wire connectors, and so on.
I’ve bought some off of eBay for 15 bucks and invaluable is the word I’d use to describe them.