how do you bleed the hcu on 2006 Lincoln Mark LT

brake system wont hold pressure after replacing a caliper driver front and bled each wheel

Asked by for the 2006 Lincoln Mark LT
The HCU gets bled through an ABS system service bleed, which is a command found using the Ford diagnostic tool (IDS).

I doubt the HCU is at issue; I would think you need to start over wheel by wheel and bleed the system; make sure a good helper is in the drivers seat helping you.