Strange inside rotor surface wear

[smackboy1]

Had my car on a lift yesterday and noticed something strange. The inside surface of both front rotors are scored. The outside approx 1 cm are worn shiny, but the next 1 cm or so looks untouched by the pads (rusty and raised) and so on. They look like the rings of Saturn. It's only on the inside surface of the rotors. The back rotors' inside surface seem to have a similar effect but much less apparent. The outside surfaces of all 4 rotors look fine. The car seems to stop fine on the street.

I replaced the front pads, dampers etc. (w/ OEM) 2,000 miles ago. Did not examine the inside of the rotors but the old pads looked normal.

Ran an autoX (braking seemed normal).

Replaced the rear pads, dampers etc (w/ OEM) 500 miles ago. Did not examine the inside of the rotors but the old pads looked normal. Flushed the brake fluid.

Ran an autoX (braking seemed normal).

Does anyone have any ideas why just the inside surface of the rotors are scored? What to do? TIA.

[SPIRO]

Calipers not releasing?

[Topless]

Calipers not releasing?

Yep. When calipers bind and fail to release they usually wear heavily on the inside rotor.