I just bought a 2000 Chevy blazer zr2
the previous owner replaced the master cylinder, the brake booster all 4 caliper pads and rotors. I replaced all brake hoses removed all four calipers lubed everything properly and bled all four corners, the problem occurs afterdriving the vehicle for a couple miles. The brake pedal slowly becomes stiff, the brakes start to drag, as if no fluid is returning, the pedal is all the way to the top.
after the vehicle sets for a while then everything return to normal.
then it will happen again……
help!

 

Is it all 4 brakes dragging Or just the front brakes?

 

How did the 4 calipers compress, easy or hard to turn?

 

You could have one or more caliper pistons sticking or hanging up,you'll know from the smell and smoke!