Originally Posted by SouthernWRX
So I looked in my reservoir Sunday and there is a chunk of black "glop" at the bottom. It's also present in my brake reservoir as well. I plan to bleed both systems this weekend. The gritty feel is gone at the moment, but I'm sure it will come back.
I noticed that in mine a while back too -- in the clutch reservoir at least (I don't remember looking at the brake reservoir). Ended up replacing most of the reservoir content with a syringe. I still have the gritty feeling at 20k miles (along with slight noise when the clutch is disengaged when the car is cold and the weather is wet, not sure if that's related).
I'm not sure that air in the system would cause this kind of thing.