No rear brake pressure

[Darkkill57]

So I finally got a new rear brake line and I went to hook it up because I need to push the piston out of my caliper for a rebuild. But after awhile of pumping I noticed the brake fluid in the reservoir wasn't really going anywhere. So I took off the hose at the master cylinder end and pumped it afew times and it was hardly pumping out drops of fluid. Is this a sealing issue in the cylinder or could it just be gummed up?

[Doc_V]

Hard to say; it could be a number of things. How old was the fluid in the rear brake? Was it black or did it have little dark particles in it? Old brake lines will disintegrate over time, and if so, you could have gummed up the master cylinder. What happened to your old brake line? If there was no line connected to the rear master cylinder for a long while, it could have become corroded since brake fluid sucks moisture out of the air, and the piston could be stuck. Either way, it sounds like you may need to rebuild the rear master cylinder as well.

[Darkkill57]

Yeah I took it apart and cleaned it out today but haven't tried it out just yet. As for the old line I tossed it cause it was showing signs of dry rotting and I wasn't havin none of that. I'm also using old brake fluid that's still kinda clear just because I need to pop the old pistons out and I don't have a compressor to do it.