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Originally Posted by Naumoff  I would never dream of using copper tubing in a brake system and definitely not compression fittings. It is not legal in the US to do.
The tubing does not look like the 90-10 copper-nickel(cunifer alloy)tubing.
It looks like regular plumbers tubing which is is run right against the steal components of the chassis. This can cause electrolysis and cause the tubing to fail. |
There is no real consensus on the use of copper piping, some countries allow it and some don't. The objection against it is that the copper work hardens and becomes brittle if it is allowed to bend through vibration. If the pipework is well supported I doubt whether this would actually occur within the lifetime of the vehicle.
You won't get galvanic corrosion of the pipe if it is clamped to steel, copper is more 'noble' than steel but you may get chaffing since the copper is quite soft.
I can't tell the fitting type from the picture but it could easily be an ordinary tube nut containing a flared end.