Did you check your brake fluid yet?

It's probably a combo of low brake fluid and worn brake pads. You can check both visually in a matter of seconds.

I'm thinking that prior to the rotors wearing through the wires in the pads, you were probably a little low on brake fluid for one reason or another. Now that the pads are worn quite a bit, the piston has to push out further than normal, so the fluid in the reservoir is lower than what it would be with new/less worn pads.



I could be completely wrong.