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There's 2 places they could leak. The valve assemblies are bolted onto the wheel with a nut from the outside - however there's also a rubberish washer on the inside to seal. Perhaps the washer is on its way out at 7 years, or the nut needs a little nudge tighter.
The other place is from the valve itself. They are standard valves and can be removed/replaced/renewed with a standard valve remover.
To check the valve put a bit of spit over it and see if it bubbles. To check the seal submerge it in water and look for the bubbles.
Currently in mister_cee333's garage:
Toyota Avensis 1.8. Formerly Jaguar X Type Sport d 2005. Formerly 2001 Laguna 2 1.9 dCi
Last edited by mister_cee333; 16th December 2008 at 04:36 PM.