There are many threads on rotor deposits on this site. They will tell you how to diagnose ("shudder" when braking), how to fix (bedding), and how to prevent (don't come to complete stop after hard braking).
Instead of using this site's search, I prefer to go to DuckDuckGo (or any other major web search engine) and add "site:the370z.com" to my search string. eg:
rotor deposit site:the370z.com