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So 1 week ago I did the brakes on my 08 fusion SE. I did front pads, hardware and had the rotors turned. The rear had new rotors, pads, and hardware. I used the rear caliper tool to spin the pistons back in. The brake lines were never opened during this. I had the master cylinder res. cap off when I compressed the calipers so I had to remove some fluid as I did this. The brakes worked great until my daughter drove the car and hit some potholes on the dirt road by us. Ever since then I have a low brake pedal. The fluid level never goes down and there aren't any leaks.The front brakes are the only thing working at the bottom of the pedal stroke. When I press the brakes while driving I can feel the brakes starting to grab about halfway down then the pressure goes away until the last quarter of the stroke. I bled all the brakes out and tried it again but it did the same thing. It sounded like the master cylinder went bad so I picked up a remaned one from O'Rielly's for $110. I bench bled the new one and installed it then bled out all the lines again and made sure all the new fluid had flushed out the lines. The f-ing thing did the same thing when I test drove it. I had read that sometimes air can get into the abs module so I took the car to a brake and muffler shop that I used to work at to have them bled the abs module with the computers help. They said the lines need bleeding and it would be $30 so I had them do it. After and hour or so they test drove the car and then pulled it back in. The messed with it for a while then came over and told me the master cylinder is bad. I explained the situation and they said the remans are crap and that is what is wrong. They would bleed the lines for free next time. I took off the master cylinder and took it back to the store and got another one. They said it sounds weird to them since the remans don't give problems usually. I put in the new M.C. and bled the lines again but I'll be damned if it didn't do the same damn thing. When I was bench bleeding the new M.C I noticed that more air would seem to enter it somehow when I was working the shaft. The air seemed to come out the front port only. I wonder if maybe my res. bottle for the M.C. might have a sealing problem and if anybody has had this happen before.