Are you having cluth problems at the same time? E-brake issues?
All three of these pieces are using the same fluid reservoir. My issue came from seeing the e-Brake light come on while driving, and then go off. Then it stayed on constant the next day, and when I went to leave the office I had no clutch. Ended up being the master->slave cylinder connection tore right out of the master. Good thing is it was a TSB, and I got it fixed free. =)
I had this same issue when my front wheel bearing was going out. The bearing had so much end play the caliper was pushing it apart instead of clamping to the rotor. Check the wheels for end play, you could be having a similar prob as I was.
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