[kamikazeplus]

I have this problem, when the brakes r cold they r normal but when I start driving they got pressure and start slowing the car down, to the point that all 4 calipers smokes (pedal is all the way up).
So far
I replace front calipers.
Flush the system.
Replace the brake master cylinder
purge system

 

[rogoman]

This type of problem is usually caused by a bad master cylinder not releasing pressure. In your case, the replacement master cylinder may have the same problem.