Stuff to maintain

[Silversmith]

As maintance goes, I just noticed a spot on my rear pass/side outside face(ERA std. IRS w/inboard brakes) of rotor. about 1/2" on the outermost part of the(all the way around) rotor that is being (not bad yet!) chewed! The pads are in fine/new shape, as are both rotors. Except this new/newly descovered chewed section. After spotting it, during 4 wheel weighing & alignment. I was able to also hear the slight grinding sound (during idle slowing stop) on the way home from the balance shop. I could hear this with brakes being, or not being applied. No weight/balance adjustment was required! As the car was 50/50 F/R & 0/0 L/R, w/out being seated. Alignment was also dead on! That in it's self was awsome! Is it possible a spring or other part of e-brake has come loose & is rubbing on rotor? Has anyone else had this type of problem with a standard ERA-IRS w/inboard brake system. I will be inspecting the rear brake system right after Easter. But thought I would ask you guys 1st. Thanks in advance!