What is is this vacuum hose and where does it go?

I discovered this broken vacuum line on my 04 Grand
Marquis while inspecting vacuum lines to fix the ac. I saw a
video on YouTube that showed it going to a "parking brake
actuator" but I don't even see that under my dash. Is it
possible that the previous owner had it removed or does
the hose go somewhere else. Its a white line routed from
the engine bay by the cowl panel then inside the cabin
behind the gas pedal. Its been hissing ever since I fixed a
kink in another vacuum line and its driving me up many
walls . I would go to the junkyard and take a look at one
but its a 2 hour drive. please feel free to email me pictures
@ getertrey@gmail.com