Car has 84k on it. Brakes done at last major tuneup before I bought the car, sometimes when I am at a stoplight and the light goes green I take my foot off the brake and the pedal sticks down and the car does not begin to roll, and I need to accelerate harder. I have done some searching but it looks like the other problems were taken care of via the dealer. I recently moved to El Dorado Hills in CA, near SAC and do not know the dealer up here that well. So I wanted to see if anybody has had any experiece with this problem and been able to fix it. I checked the brake fluid and it is full and fairly clear....

Suggestions? THX