Leaking Clutch
 

The master cylinder just was replaced in my 87. When I am pressing the clutch in, it often pulls all the way back to the floorboard and gets stuck in gear. I can release it by pulling the clutch back out, resulting in brake fluid pouring all over my feet. I'm not sure if it is the master cylinder or a leaking line. What is the best way to figure out the exact problem? The line is hard to follow all the way through so I can't really see the leak.