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Mystery wire & hose under bonnet


stuntman

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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 . 

1664625805184106150640312458709.jpg

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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 . 

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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

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