We were cruising along at 65 MPH near Green Bay, WI, when the tow vehicle screen announced in red letters: "replace your brake pads right away!"
Why would that happen? We had towed a lot (for us) this summer, about 2400 miles, and the TV was due for annual maintenance soon. I did have one near panic stop when a truck pulled off a farm road right in front of us, and the brake pressure seemed high, but not crazy high.
We got to the RV park (Apple Creek, near DePere, WI - decent place), and backed in normally. Then I saw the umbilical lying on the ground, with frayed wires hanging from one end. The 7 pin plug was still in the TV receptacle, just no wires... and it's mounting plate was twisted 45 degrees inward!
The 18 inch adapter pigtail, used for the extra foot or so of Hensley Hitch length, was still connected to the main umbilical. So it must have bound up, and yanked hard enough to bend the bracket and pull out of the plug head! I've always tried to be a conscientious tow-er, and double check that the cable has enough travel, but I surely missed something.
Shame on me.
About 150 miles with no brakes or lights. I failed to notice the "NC/no connection" on the Prodigy brake display, and didn't think the brakes were overtaxed based on pedal feel.
Fortunately, a properly matched TV/TT combo, four big disk brakes, reasonable speeds, and a high-end hitch got us through OK. Whew. We're all responsible for safety of ourselves and others, and I hate to think what might have been.
Resolution: The local BMW dealer got us in for service right away, Hensley quick-shipped me a new pigtail. And, you can be sure I'll be watching and double checking connections more thoroughly!