Hey guys! I'm in the process of installing a vacuum assisted brake system and needed to put some fittings in the vacuum line to the brake booster. When I cut into the vacuum line, it was about 1/3 full of this thick black/brown tar that was settled at the bottom of the line running the entire length. It didn't look like it got past the check valve at the booster and the valve is still functioning.
I'm obviously going to either clean the hose or replace it, but I'm just wondering if anyone has ever see this before?