I am having a very similar problem. Except I think mine might be completly gone. When i put put the car in gear, it will hardly stay in one place. The check brake light is on. I was thinking it may be the master cylinder, but I have not had the time to trouble shoot yet, good luck.
we are in rio vista.. that is about 20 miles away.. we will be in fairfeild on friday... if you would like we could bring it to you if you want to buy it