I have a 98 f150 4x4 ,the problem im having is my brake petal goes almost to the floor so i adjusted the rear drum brakes and it gives me my petal back to normal but it only last for a couple of days then its back to almost going to the floor, i have replaced all the front pads,calipers,and disks, rear brakes replaced pads and new spring kits and adjusters ,also has a new master cylinder,took it to 2 different brake shops and they just adjust the rear brakes and to set the parking brake each time i park it,i do this and it last for a few days of driving then back to the same old thing ,does anyone have any thoughts on this thanks

 

I might have an answer. I have the same type of problem and am told that the ABS system can have an air lock. The only fix it to take it to a ford dealer and have them reset the ABS.
Costly, though.
We are trying this today, I'll let you know tomorrow

 

Ok yeah let me know how it goes, this is driving me nuts