Howdy all, long time since I've posted here. Wifes TTq just starting having a clutch pedal issue, it comes up slowly now, and does't come up all the way leaving about an inch left of travel.

I checked the brake fluid reservoir and it looks fine. (assume it shares the same fluid like my M3 and Z06 and don't see any other fluid containers)

Any ideas? Master cylinder? Cost to replace?

It's her baby and need to fix it soon....thanks!