Adding air compressor to bus

[bevans6]

My personal fail is 45 seconds, because that's what I was taught when I took the Ontario DOT school and test.  I've seen up to 2 minutes listed on various places in the interweb.  My bus normally takes about 15 - 18 seconds.  Important to have two things in place - first is all ancilliary users of air - like wipers, air suspension - off or fully charged up, so they are not taking air while the compressor is filling air.  Second is to have the engine at a fast idle - 900 - 1,000 rpm - to do the test.  It's not representative at a low idle of 500 - 600 rpm.

Brian