Generation 1 Prius Newb Questions

Hello,
Not sure if this is where my question should go but....
Where is the brake reservoir in a generation 1 Prius?

Would it be the yellowish container in the upper left hand side?
I can't post a picture, but if you google "generation 1 prius under the hood" it's the picture that is in the 2nd row from the top, 3rd from the left.

My brakes have recently become squishy, and I think i may need to replace the master cylinder. But first i want to check my brake fluid levels.