I have an 07 Expedition with 147k miles on it. While replacing a bad rear caliper I could not get the brakes bled. I tried bleeding each caliper and master cylinder multiple times but no matter what, after a few miles of driving the brake pedal would fall to the floor and I had to stand on the pedal to get it to stop. Pretty scary to say the least. I took it to a reputable shop, they replaced the master cylinder after bench bleeding it but they ran into the same problems. Braking would be fine for a few miles then the pedal would fall to the floor. They told me the abs module was the culprit but at 600-1k I want to see if anyone else has had this issue. There have been no codes thrown and it will drive normally but braking is a nightmare. Since I drive my 2 year around I decided to park it. I really need to get it repaired asap. Any help is greatly appreciated.