i've known i had a slow air leak for a while. It takes over nite to air down and i've been all over the brake lines and tubing with a soapy bottle trying to find the leak. no luck.
today, while working on my dash board gauges, i noticed an audible leak that you don't hear with the dash board closed up.
the elbows into the pressure gauge seem to be my leaky culprits and i'll replace them in a day or so.
while inspecting the system in the dash. the parking brake control knob also was leaking out of the exhaust port. i took it out and cleaned up the valve which seemed to fix that leak.
when i started to reassemble the park valve in the dash, i noticed what looks like a broken air fitting on a line that doesnt attach anywhere.
each air line is a different color so i looked on the internet and found this:
black - wet air (charging)
green - tank #1 (primary)
orange - tank#2 (secondary)
red - tank #3 (park brake and trailer supply)
yellow - park control ore service brake
the mystery line is a black one. it almost reaches the exhaust port on the park valve, but not quite. i don't know what else it would be for in the dash.
take a look
it wasnt hooked to anything. the back of the parking valve may be part of the elbow on the black line. there is no fitting on one side of that elbow.
any help or wisdom appreciated.