e brake not working
 

I have an fb and my e brake is not holding to good. If i have it pulled all the way i can still get my car to move by pushing it. I have tried adjusting the cable and i made it as tight as i could and i still have the same problem. There is plenty of material still on the pads. They are disk brakes.
Could that be my calipers or just pads?

Any help would be appreciated.