Do I need to replace my rotors when doing my brakes on my car.

Hello, When doing any brake service, it is mandatory for proper performance and operation to either resurface the rotors, or replace them. Most VW/Audi/Porsche rotors call for replacement, and, especially on performance models, there are optional brake rotors that MUST be replaced when the pads are replaced to ensure simple safety. Here is an excellent description of the service, and what it entails/what variables are present (select 'front brake service'): https://repairpal.com/estimator/audi/s4