right under the master cylinder. If so, the master cylinder is shot and you need to replace/rebuild it. This is a pretty common problem. Search for it, there are plenty of posts about this.
Daily Driver: 1997 Red Geo Metro 2 door Hatchback Truck: 2007 White Nissan Frontier SE Crew Cab 6 Speed Z: 1993 Stage? 300zx 2+2 Grocery Getter