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Q: 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
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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.
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