Brakes overheating after driving a while

Take it for a drive and when it starts to lock up, open a bleeder in the front and in the rear to see if there is residual pressure there. There shouldn't be any with your foot off the brake. It will dribble a bit when you open the bleeder, but, it shouldn't spurt out. If opening the bleeder(s) releases the brakes, you have a pushrod adjustment problem where the master cylinder piston isn't returning to it's stop.