How can i know if my rear brake disks are orginal or not?
on casting marking ? on 2005 Toyota Corolla

my handbrake brake pads were frictionig on the drum. And there was a noise? on my way to home i heard a breaking sound from back. when i got to repair shop. i saw brake peds spring were broken.
after this i saw a cavity on the outer diameter on the right-back disk. please help me to solve this problem...

Asked by for the 2005 Toyota Corolla