Apologies for the reply in responding as I didn't want to jump the gun and assume everything was OK. I set out to carry out the silicon spray job as recommended by "X5-D-Sport Salisbury" and carried out the initial removal of pump / compressor unit. Had a little look just to suss out what he was ...

[quote="X5-D-Sport Salisbury"]
If the Valve block is acting up, understand that the air it draws thru it is the unfiltered dusty filth that sits in the tyre well... the same dusty air that gets stirred up with every pot-hole & bump..

This eventually dries out the seal "O" rings in the valve block ...

Hi
Normally when I open the car using the remote the rear suspension pumps up and you can indeed hear the compressor running.
The last few days this has not happened and the rear arches sit just above the top of the tyres on both sides.
I connect INPA to the car and pump up the suspension ...