This sounds Dangerous! Hissing.
Ok, so I was driving my 156 2.5 V6 down a road with speed humps, slowly. went over a bump, accelerated away and suddenly heard the sound of hissing fluid as if a pipe had burst. The hissing lasted about 5 seconds and stopped once pressure had balanced it seems.
Fearing the worst, I coaxed the car home a mile away. Had a look underneath... nothing obvious.
Opened the bonnet and I could see a pipe dripping fluid (see attached images and video). Followed the steel pipe back to it's origin and it appears to go to the power steering reservoir. Or at least it disappears into the firewall underneath the power steering reservoir. Also there appears to be fluid dripping from beneath the reservoir.
Does anyone know what the pipe, pictured, is for? and has anyone encountered the same problem?