Mystery wire & hose under bonnet

[stuntman]

Hi could anyone identify this wire and also the pipe Save 

me pulling out more stuff. Ventilation system

The Wire colour is Blue with a  white trace and a very thin gauge its by the rear of oil gauge just hanging there see picture. The hose has a broken peice of pipe stuck into it  the other end goes into a clear pipe and exits after the battery through inner wing . 

[sopor]

Hose could be part of the headlight height adjustment system?

[stuntman]

Exit point of pipe lower then battery.  Just removed head lamp and its connected to a brown pipe .

[TargaWayne]

Blue and white cables are used for the lights in the gauges on the wiring diagrams on an 87. 

[TargaWayne]

If it's near the oil gauges then it likely to one of these.

[Nige]

The cloth covered rubber hose looks like it could be the brake fluid res overflow.  The plastic bit in the end should be attached to the fluid res.

[stuntman]

That pipe has been disconnected  ever since since I've owned the car 10 years  ago . But I've changed brake fluid several times . Thanks for the information. 

[limalbeps]

I would say Nige is spot on … my reservoir overflow did the same thing . I think the plastic gets brittle and breaks right on the join with the reservoir 

[stuntman]

Pipe now reconnected. Why did porsche need a pipe to vent the brake reservoir ? .  Also I've pull out the oil pressure gauge still can't track the blue wire with white trace couldn't see it on the wiring diagram car is  a 1987 Targ.everything looks to work Any ideas . 

[SilverWT]

1 hour ago, stuntman said:

Why did porsche need a pipe to vent the brake reservoir ? 

Not a vent, an overflow.

In case of overfill, or when fitting new thicker pads that displace more fluid than the old ones.

Mark

[Lesworth]

Its also cleverly designed to ensure that you spill most of your new brake fluid onto the floor under the car when pressure bleeding your brakes, as a result of forgetting (every time) to plug it. 

[Type911]

BTDT

[Nige]

Yep, you need to clamp that hose to bleed your brakes properly.