It should use brake fluid like every other manual transmission car. They normally dont have separate reservoirs.

 

you can check the pentosin level under the frunk, drivers side. There is a reservoir there under the plastic cover.

The design is a joke, so many cars have issues with it from 996 AND 997 as if they have not learned their lesson many years ago. Probably means big $$ to the dealers after warranties expire, total bull$hit if you ask me.

If mine fails again Im doing the GT2 conversion and doing it at a tuner vs. temporary dealer fix.