Brakes overheating after driving a while

FYI, your rotors are junk. It might not be the cause of your problem although if they are warped they might be dragging the pads to the point that the fluid is boiling and the expansion is pushing the pucks out.
With the correct master cylinder and proper push rod adjustment, that won't happen.....in fact, you might get no pedal or braking at all with bad warpage and boiling fluid.