The ACS & its associated Airbag hasn't really changed since its inception on Spyders; and the only real differences between the Auto and Manual systems from 2010 right thru 'til the present day are that the Auto systems have the addition of a compressor (item 210 & assoc on the diag), a relief valve (item 360 & assoc), and the height level sensor (item 390 & assoc), plus a few different length hoses/tubing & their connectors, a bit of wiring, & possibly a dash switch (a switch that's probably incorrectly labeled Hard/Soft where it really should say something like Up/Down or High/Low
); while the Manual system simply has a hose that runs directly from its fill point at the Schraeder Valve down into the top of the Air bag & can only be adjusted manually thru that. There
might be some other effectively minor variations, but yours is going to be pretty much
EXACTLY the same as that shown in the diagram Quickdraw, only without the addition of those components identified that make it 'auto'!
But I believe the real point trying to be made by T.P. Quickdraw, is that the '
Airbag' is
NOT a '
shock' or even an '
Air shock' - it's an
Air BAG that's quite separate in the suspension/its action &/or contribution to the suspension from the shock/coil assembly; and the volume of air in that bag is only really used to adjust & hopefully maintain your preset ride
Height, regardless of that being set manually or automatically! :lecturef_smilie:
And as with everything similarly made out of 'rubber & its variants', these Air Bags are prone to leak air out over time - even if there's no 'leak' or puncture per se in the bag - just like in your tires, air & therefore pressure will gradually work its way out by seeping thru the 'rubber' at a molecular level. Well, in the case of these particular Air Bags, this actually occurs somewhat quicker than it will in your tires, largely because the air bag is so much smaller and as the suspension absorbs road shock & bumps, the pressure peaks a lot higher & spikes/decompresses rapidly, so the air gets forced out thru any means possible & therefore pressure will drop pretty quickly - but if you're having to pump it up from flat or close to flat more often than about once a fortnight or so, you've probably got a bigger leak or puncture somewhere or the valve isn't sealing properly! :shocked: Remove/replace the valve insert to clear/re-seat it, maybe even replace the valve insert with a new one just to be sure, then use a squirt of soapy water on the Schraeder valve, the hose, all hose joins/connectors, and especially around the top and bottom of the air bag to look for bubbles & identify where the leak might be, fixing/replacing as necessary. It's even a good idea to jack up the rear of the Spyder so the bag lifts off its seat a little - if you leave it sitting down on the air bag, that can hide any tiny leaks that might occur where the bottom of the bag has worn thru on any small stones &/or grit, dust, etc that can get caught between the bag & the swing arm's bearing surface there.
Just Sayin' :thumbup:
Ps: If you can't find a leak but are having to pump the Air Bag up from flat/nearly flat more often than about a month or so, you could try adding a tablespoon or two full of 'Slime' or similar via the Schraeder valve, once the valve insert has been removed of course; then pump the bag up to your chosen pressure & go for a 30+ minute ride before letting it sit at pressure overnight. This often works on small leaks for Manual Air Bag Systems, but is not recommended for use on Auto Systems, altho some have done just this very successfully... but you do run the risk of gumming up the valves/bleeders &/or compressor on the ACS if you do! :lecturef_smilie:
hyea:
) BRP has under-specified the shock/coil assembly such that it cannot do ITS job without some air in the airbag, even just 10 psi will work, in which case the shock/coil then works OK (sorta, anyway! 
