How do I fix this Brake Fluid leak?

I just replaced mine over the weekend. I had to pull unusually hard to get them out. I got a little instruction from my parts guy. He said that they would be hard to pull out and that I needed to pull straight up with equal force so not to break the tip or nipple because they were harder to come by.

The first one (considered the back one or closest to the engine) came out by pulling hard but slowly and carefully. I ended up pulling up on the rubber and the hole thing came up. The front was a little harder to come out because of the angle, but it came out. I kept my finger over the opening of the tube so I would not have as much to clean.

This fix also cleared up my ASC switch not working.