So I was trying to leave my house when all of a sudden it felt like I hit a brick wall when I hit my brakes and then the pedal went all the way to the floor as if it lost all pressure. I swear it felt like the subframe fell out. I stopped and got out and looked under the car didn't see anything. I put the car in reverse (its auto) and then again it felt like I hit a wall. I slowly crept it back home, and then it locked up again. The e-brake handle wont move up when I try to move it.
What happened? Is it the line or the rear calipers or what? What should I look at?

The car is a stock auto 95 S14 base.