1995 Ford Thunderbird brake problems

Brakes problem
1995 Ford Thunderbird 6 cyl Automatic 150000 miles

After about twenty minutes of driving, my front brakes would not release and the car would be hard to drive and the wheels were smoking.I checked the fluid level, blead the brakes of possible air pockets and leveled the fluid again. Now when I drive, the brake pedal goes to the floor almost and the car has a difficult time stopping all the way and when I do press all the way, the back brakes lock up and the car skids. Any solutions? And what would a job like this cost to repair?

Thanks, Chuck