Had a friend come over, complaining of a rough ride. Checked, no air in air bag. Filled it up, and it leaked out. Could not get the compressor to work. To check the bag, we used Les and Roger’s trick: run the air line from shrader valve to air bag. No parts to buy, just connect the lines from bag to valve. (Thanks Roger and Les) works great! The compressor is costly, bypassing it is free!
I remember them talking about that fix in Alaska 2015. First time we tried it, and it works!!