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Så fik jeg skiftet den tandstang og det er jo dejligt men! nu er der oliespild fra bagakslen det drypper ret kraftigt ned der hvor der er en samling med en udluftningsnippel på. Men måske komme det indefra selve bagbroen og løber ned der.. jeg får også en esp fejl i instrumentpanelet og når jeg forsøger at udlufte systemet (drejer med rattet helt til hver side) så kører den op og ned i undervognen.

Giver det mening for nogen?

Har kikket på returslangerne som jo går op i bagakslen og den ene dryppede lidt..

Actually, your C5 should no longer hold the height and sink because the spring cylinder is leaking.
The spring cylinder has 3 sealing elements - 2 of which are on top of each other.
The double sealing element consists of an approximately square sealing ring and a Teflon seal above it. If the Teflon seal is worn, the LDS flows back into the tank via the return line, which is located between the clamp and the rubber sleeve. The car then sinks slowly or faster with the rear end - depending on the leakage.
Normally, a C5 will hold its altitude for weeks.
After that comes an O-ring, which is supposed to prevent LDS from getting into the sleeve. The boot is a dust cover and LDS is not in it. If this O-ring also no longer seals, the LDS no longer flows via the return to the tank, but via the second short hose into the axle tube and it drips. Of course, LDS is then also missing.

If the vehicle does not sink, then there is another leak and must be searched for.