Thanks all. The link was great - this man really knows how to teach. I think I will risk driving it to the dealer as the compressor doesn't make any noise - that I can hear - and get both bags replaced..Time is the driver otherwise I think I could follow the instructions in the link quite...

New post from a newby- I have a disco TD5 2003 model - Right rear wheel sinks slowly down to its lowest point whenever the engine is turned off. Raises and levels again with the engine on. Air leak? Where? Nothing obvious to be seen at the rear end on a cursory inspection. Anyone else had...