2021 F-150 Brake Controller problems
Long version of what is going on for a bunch of us is here: https://www.f150gen14.com/forum/threads/trailer-brake-not-working.3039/ Short version is that there is an intermittent issue with the TB...
Forum Discussion
I didn't read the whole 15 pages, but it seems to me that there are those that did incomplete troubleshooting. There are more connections in the truck and trailer brakes than just at the bumper, and spreading grease is not a repair.
