53wlee53 Posted October 10, 2018 Report Share Posted October 10, 2018 I have a 2009 M2-106 ISC air brakes, suspension and cab. When the system charges sometimes it does fine. Off about 125, on about 100. other times off at 145 or the relief valve opens and it drops till low air buzzer come on. Or to about 110 then it starts charging again. Thought it was the governor, Changed it same issue. I'm thinking the only other thing is the dryer. Any ideas? Only 80k on the truck. Also sometimes the air will drain down in 1-2 hours, sometimes days. I can't hear the leak,(to many years using skill saws and nail guns without hearing protection).Who needs ear plugs.. Going to get my #1 helper (wife) to get on the creeper tomorrow and go under the truck at the dryer and listen. Wayne 2009 Freightliner M2-106 Crewcab 8.3 Cummins 330/1000- Allison 3000RDS 2003 Newmar MountainAire 39 SDTS Link to comment Share on other sites More sharing options...
RickW Posted October 12, 2018 Report Share Posted October 12, 2018 My first guess is the air governor. I see you already addressed that but there is the possibility you may have got a bad one. Searching for an air leak I recommend using something like Inficon - Whisper Ultrasonic Leak Dectector. You can use it as shown in the link or add/plug-in a set of ear phones. 2017 Entegra Anthem 44A SOLD - 2004 Volvo 780. 465hp and 10sp Auto Shift (from 2010~2017) SOLD - 2009 Montana 3400RL Link to comment Share on other sites More sharing options...
53wlee53 Posted October 13, 2018 Author Report Share Posted October 13, 2018 It's kinda hard to believe to governors are bad acting pretty much the sam way, but it's possible. I'll try that first. Changed the dryer 3 years ago. Strange thing when iv'e tried to drain the air tanks only air comes out. NEVER a drop of water, mist, nothing. Thanks for the input Rick. Wayne 2009 Freightliner M2-106 Crewcab 8.3 Cummins 330/1000- Allison 3000RDS 2003 Newmar MountainAire 39 SDTS Link to comment Share on other sites More sharing options...
DesertMiner Posted October 13, 2018 Report Share Posted October 13, 2018 Might want to see about changing out the air dryer filter if it’s been 3 years. Link to comment Share on other sites More sharing options...
53wlee53 Posted October 13, 2018 Author Report Share Posted October 13, 2018 Thats the plan. Im going to take the dryer off th truck and inspect it the best I can. Check the relief valve,ect. Wayne 2009 Freightliner M2-106 Crewcab 8.3 Cummins 330/1000- Allison 3000RDS 2003 Newmar MountainAire 39 SDTS Link to comment Share on other sites More sharing options...
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