hatrack Posted December 3, 2020 Report Share Posted December 3, 2020 I think that the rear suspension leveling valve on my truck is bad. When I drop the rear and turn the key off the rear raises backup and now it is loosing all the air in a couple days and the rear bags go flat. Is this caused by the leveling valve or maybe a leak. What do you experienced guys think it is? I haven't done anything on the truck but wiring for the jacklopee and the taillights. Limited knowledge on the mechanics of the air system. Thanks, Ken.... Quote 2017 DRV Fullhouse JX450 2020 Volvo VNR 42-640, D13, 455hp, Ishift, 189"wb, factory single, ET Junior Hitch @ 195", Jacklopee, Directlink 2016 GMC 3500 Denali DRW, CC, LB, Curt 25k, Sold Link to comment Share on other sites More sharing options...
Darryl&Rita Posted December 3, 2020 Report Share Posted December 3, 2020 I think the manual air drop is on a keyed circuit, ie when the key is turned off you loose control of the release. As far as the pressure dropping, that's a leak somewhere. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
Nigel Posted December 3, 2020 Report Share Posted December 3, 2020 I suggest doing a google search for air brake inspection. If your suspension is staying up for a couple of days you are doing well. There is a reason there is an acceptable air loss rate, every air brake system leaks. Nigel Quote 2006 Volvo VNL 430, 2006 smart cabrio cdi, 2000 Triple E Topaz 30' Link to comment Share on other sites More sharing options...
HERO Maker Posted December 4, 2020 Report Share Posted December 4, 2020 What year truck do you have? Some of the Gen 1 trucks will stay down once the key is off. Gen 2 and newer - I'm not sure, but I know of a couple that will come back up after key is off. Doesn't sound like a leveling valve problem, you've just got some air leaks as mentioned. Have fun finding them. Quote Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted December 4, 2020 Report Share Posted December 4, 2020 1 hour ago, HERO Maker said: What year truck do you have? Some of the Gen 1 trucks will stay down once the key is off. Gen 2 and newer - I'm not sure, but I know of a couple that will come back up after key is off. Doesn't sound like a leveling valve problem, you've just got some air leaks as mentioned. Have fun finding them. Don't think age is an issue... I'd bet he just has air leaks at the pass thru under the dash and tanks. Basically anywhere there are a bunch of the pushlock fittings. 2020 Volvo VNR 42-640, D13, 455hp, Ishift, 189wb, factory single, ET Junior Hitch, Jacklopee, Directlin Quote Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
rickeieio Posted December 4, 2020 Report Share Posted December 4, 2020 1 hour ago, HERO Maker said: What year truck do you have? His signature indicates a 2020 truck. I've seen it. Pretty sharp rig. Quote KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
HERO Maker Posted December 4, 2020 Report Share Posted December 4, 2020 Rick, that is Jim's truck, not hatrack's track. And I'm wondering where my signature went! Quote Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
HERO Maker Posted December 4, 2020 Report Share Posted December 4, 2020 Jim, did you change trucks or are you posting the OP's truck? Quote Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
Parrformance Posted December 4, 2020 Report Share Posted December 4, 2020 The Gen 2 Volvo I own, airs the bags back up when I turn the key off. Hunt the PTC fittings from the rear most bags to the leveling valve and fix the leaks. My bags will now stay firm for weeks. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted December 5, 2020 Report Share Posted December 5, 2020 21 hours ago, HERO Maker said: Jim, did you change trucks or are you posting the OP's truck? Posting the OP's truck. Quote Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
hatrack Posted December 5, 2020 Author Report Share Posted December 5, 2020 Thanks everyone. I'll start looking for leak when the weather gets better. It will hold air a couple days. Thank Rick you're also. Ken.... Quote 2017 DRV Fullhouse JX450 2020 Volvo VNR 42-640, D13, 455hp, Ishift, 189"wb, factory single, ET Junior Hitch @ 195", Jacklopee, Directlink 2016 GMC 3500 Denali DRW, CC, LB, Curt 25k, Sold Link to comment Share on other sites More sharing options...
jenandjon Posted December 6, 2020 Report Share Posted December 6, 2020 You will drive yourself insane chasing all the leaks. If you stay aired up for a couple days that is very good. I have a 2021 Kenworth with 6000 miles on it. I have to air it up every morning. They are not meant to hold air forever. As long as you have no audible air leaks. That is if you can stand next to it and you cant hear any air leaking you are good. Quote Farmer, Trucker, Equipment operator, Mechanic Quando omni flunkus moritati-When all else fails, play dead I'm a man, but I can change, if I have to, I guess. Link to comment Share on other sites More sharing options...
Danandfreda Posted December 7, 2020 Report Share Posted December 7, 2020 Our 2021 kenworth didn’t hold air in the rear bags for very long (overnight). We flipped the rear air bag dump switch to air it up and dump and some king of grease came out of the valve. Since then it held at about 110 psi overnight Quote Link to comment Share on other sites More sharing options...
Parrformance Posted December 7, 2020 Report Share Posted December 7, 2020 I chased all the leaks, because they were so numerous it would occasionally go down during a dinner stop. I was able to find and cure enough leaks to get all the air bags, including the cab bags to stay up for weeks. This was well worth my time. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
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