Issue has already been fixed just looking for some root cause from pros.
2007 F150 had noise in Noise in the driveline so I lifted it so I could run it in 4WD and listen to the driveline. That issue is also resolved (pinion bearing)
Wheels were Spinning at around 10 mph when I located the noise and then applied the brake to stop them. Immediately got ABS and brake light illumination and a code for ABS computer failure.
The ABS system would have activated as it assumed all wheels locked up since this is basically what the system would do normally had I for instance hit the brakes at 10 mph on an ice sheet, Did I just get lucky finding a bad component before I actually had to rely on it doing its job or did I cause the fault?
Fortunately I found an ABS controller at a junkyard and was able to install and program it in my garage. Total repair cost was less than $30 but I’d still like to know what happened.