Remember, accelerometers can most directly measure the rate of change in speed of the vehicle (how fast is the truck stopping?). I assume the Brake System Control Module (BSCM) uses information from the ABS sensors at each wheel as well as data from other speed sensors.

Big software changes are in store for the '09 if they truely can incorporate VSC (Vehicle Stability Control) (I believe Ford calls it "ControlTrac"?) into the brake-by-wire system in the FEH. At least it would finally silence all the FEH naysayers who swear nobody should ever operate a vehicle without VSC - lest they die a horrible death.

Do a search on this forum for "shop manual" and there are several links to ebay sources, etc. I chose to get the DVD version supplied to dealers - for around $70.