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Hello and welcome to just answer and allowing me to assist you. Did you bleed all the air out of the system? did you bench bleed the master cylinder? How did you bleed the system if you did?
There is a couple of things I'd like to see you do, bench bleed the master , but now it's mounted you can do it on the vehicle I'll explain how in a min, the other thing is to Vaccumm bleed it because some systems are real finicky to do. One question , are all the parts you used after market or OME factory original new parts?
new but OME or after market?
Ok that ads another perspective. What happens if you pump the brakes up do they come up or not?
ok you only replaced the one caliper right? How many miles are on this car?
ok YOU DON'T HAVE ANY EXTERNAL LEAKS AND WILL PUMP UP . tRY THIS AND LET ME KNOW WHAT HAPPENS.pUMP THEM UP AND HOLD PEDAL DOWN AND SEE IF THAT STAYS UP OR BLEEDS DOWN. hOLD IT FOR ABOUT 1-2 MIN.
are you loosing fluid from the reservoir?
Thanx for that info.So you don't see any external leaks, and it does pump up , I am assuming you have an internal leak in the master cylinder.Sometimes they sit too long on the shelf and seals dry and shrink. then they can leak internally as well as suck air in on the release. But beware you could run into the same problem getting another one from the same source.
Sure here you go, https://www.youtube.com/watch?v=kEPXgDGU6_0
The ABS was from another vehicle? I just was looking at some other forums and your not the only one with this issue on that model.I would collect info from others with the same issue and call FORD customer service and see what they say It looks like it's a defect in the ABS pump or valving system. I will send you a link with a forum so you may see others with the same problem.As I am unable to help you at this time please just ignore ratting me and you shouldn't be charged.I hope you find an answer for this and I would like to hear what it is. Good luck. http://www.fordfusionforum.com/topic/8823-low-brake-pedal-wont-go-away/