HELP All 4 Brakes Continue to Lock Up

[helix73]

So in the past 48hrs ive had continues problems with my brakes, they just randomly started to seize up on my way home, so i replace my BMC and thought it helped. But my rear calipers were still sticking, so i replaced them because the piston boot was damaged, but still the problem continues. So i took apart my front calipers and cleaned them and ended up replacing the slider pins on the bracket because they weren't well lubricated and were stuck. But still my brakes continue to stick after about 2 or 3 pumps on the pedal. Im replacing the brake booster tomorrow.

Has anyone else had this problem?!