Question about air suspension

[ChuckMC8]

I hope this isn't confusing since there are two topics kinda going here at once-Dave, The air dryer is located just behind the front axle on the front bulkhead. You have to block up the coach to be safe while under there, so be careful.
         If it isn't purging (blowing off) the purge valve could be cruddy or froze (water collects in the bottom of the dryer and when the valve opens at 125psi, it 'purges' the water out. The purge valve has a heater element that is either 12 or 24v, depending on your application, that thaws the water and lets it purge))
    When operating correctly, its easy to monitor your air system fro the drivers seat, even while underway. Just watch your air gauge, at 125+ or - a pound or two, the dryer will purge, the sound under the floor,almost at your right heel. When that happens, the air gauge no longer rises and you can hear the compressor cut out (quit pumping)
depending on your air use or leakage, watching the air gauge, the compressor will kick back on at 90 psi, you'll hear that too, and watching the gauge, the cycle begins anew till the pressure builds to  the governor cut out (125) and the dyer purges.
       Theres a great air brake handbook on the Bendix web site also that tells what you need to know, and all bus owners need to know how to do the "clap" test.......R.J. Long has the best description of this procedure and most folks have the info bookmarked. Will someone post a link to it?
here a link to the Bendix service page for the AD-2 Air Dryer. HTH Chuck

http://www.bendixvrc.com/itemDisplay.asp?documentID=4852