drift punk

i forgot 2 mention, it was in drive when it happened, i was doin 110 then all of a sudden it started to shudder to a violent stop!

i have a r33 auto gtst, the problem is...... i was driving down the high way when all of a sudden the breaks lock up, it felt like i burst a tire, so i pull over, i was on a hill, and i put it in neutral and it didnt roll at all, tried pushing it and still nothin, then i turned it off 4 10 mins, then the breaks were released! what is the go people? is it the ecu? is it the breaks? thanks