Back end goes down

[Graham44]

My discovery td5 sometimes goes down over night but will level ok if I start it up ,I can not here any air and the bags are good and have put a new compressor pump on

[Blanco]

First instinct says the airbags probably aren't fine.... unless you have just changed them. Mine lasted just under five years, looked OK, sprayed for leaks etc. found nothing but the wear section of the bags where they roll effectively ends up porous, you don't see a leak as such but the air bleeds out. Your new pump is now at risk because it will overwork. If you want to double check the airbags then get some Schrader valves to fit the pipes (ebay from about £8) and pump them up by hand (I slipped the individual pipe out of the valve block rather than cut anything). It doesn't take long to do and it will tell you whether you are right about the airbags.

[bear]

+1 on the bags.

Griff

[Rickspark]

I'd suggest you pop it on some ramps and spray along the pipe route, at joints and the airbags with gas leak detector fluid or water and detergent to highlight the leaking area.

[Ally V8]

Very unlikely to be the pipework,spray the bags with soapy liquid or even WD40. Then get someone to bounce up and down on the back suspension,you will soon start to see the leaks.Doing it static rarely works.Coil conversion is a darn sight easier.