I have a 2008 RAV4 2WD that's having an issue with the brakes. The pedal slowly oozes to the floor. I know the automatic fix is to replace the master cylinder which I did. However, the problem persists. It's not losing fluid since the reservoir level is not changing. So I'm stumped what could be causing the problem. The car is equipped with the anti-skid and VCS system, so I'm wondering if there's something funny going on there. Has anyone run across this situation?