Air Leaks

[dspithaler]

Hi Guys
I was chasing down some small air leaks & found some in my push on plastic
fittings & a pipe fitting at my steps. I found a 1/4" copper tube dropping down
in front of my battery box front street side. It is not connected to any thing &
there is nothing there to connect it to. It is leaking enough air that it drains
my auxiliary tank over night. Does any one know where this tube go's to? I
though it went to my park brake to release the air but when I released the brake
the air didn't exit there.
Don Spithaler
89 SP 36'
Butler, PA