63 c10 front brakes are stuck

[jserrato714]

Hello peeps, I decided today to finally drive my truck around the city for the first time. To my suprise after 5 minutes of driving, I hit the gas and theres a lack of responce almost like someone was holding the truck back. I pulled in to my driveway and my brakes and rotors where super hot. Hot enough that it bubbled my wheel paint. I had this problem before where the brakes stay stuck and literally dont let go so I replace the brake pads,brake hoses,and the calipers with new ones. I thought I had resolved the problem too I found out today that I was wrong. NOTE: I have power brakes aswell as front disc brakes off a 73 c10 truck. What can It be? I did the booster test ..with the truck off I pumped the breaks until the pedal got hard and then started and the pedal went down like it should with the engine vacuum. What am I missing here?a pinched line some where acting like a valve?can it be the drum breaks in the back? PLEASE HELP....DONT HAVE A CAR TO GO TO WORK.THANKS TO ALL!!