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Old 05-02-2019, 10:33 AM   #15
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I have a question for those that have had a air dump system added to their M2. Does the system dump just the air bags and hold air in tank or does it dump all the air from tank as well?

It dumps the whole suspension air system including tank down to about 50psi. It does nothing to the brake system and tank.
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Old 05-02-2019, 11:40 AM   #16
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When done properly, only the air bags (suspension) are dumped.
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Old 05-02-2019, 03:42 PM   #17
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Paul

That's what I have been trying to figure out how to do. Only way I can think of is there needs to be a isolating valve on tank side of the leveling valves along with dump valves on the bag side of leveling valves. Also trying to decide if there would be any major drawback to just dumping the whole system, tank and all, as BMGM is doing? Only draw back I can think of would be a little longer to build air pressure back up, not really that big of a deal and one less valve to malfunction. I very well could be over thinking this.

The other way I am thinking of going is super simple, just putting manual dump valves in space in front of generator hitched up on bag side of leveling valves, that would dump tank as well. I never set up without doing a walk around so not being on dash would not be a really big deal, plus simple as it gets and all but fool proof.


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Old 05-02-2019, 10:38 PM   #18
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In my searching and talking to truck shops, the method I used is the most common when retrofitting to just a rear air bag suspension. Even after a day or two, my suspension system and tank have bled down just the same as me dumping it. The other method is like most Semi trucks come from the factory which has the dump built into the leveling valve which is more expensive to retrofit or by using a pilot valve system. Some good info at the link below, air dump is in chapter 4.

https://www.hwhcorp.com/ml57000-014.html
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Old 05-03-2019, 05:50 AM   #19
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At ATC the guy I always dealt with was Josh. They did a good job and only the air bags drain.
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Old 05-04-2019, 05:47 AM   #20
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I did it myself for under $200 on our Seneca. Basically you take the line that runs from the auto level valves to the air bag and put a tee in, then run the line off the tee to a solenoid valve. I also added a ball valve before the solenoid valve just in case of a valve failure. For wiring, I grounded the valves where they are mounted so I only had to run one wire to the cab then ride through a relay to a air dump switch. I didnít tie into the ignition to prevent accidental dump, I just set up a deadmanís setup where the dump switch is on the right side of the dash and a push button momentary is on the left and both have to be pushed at the same time to dump. This dumps the rear bags in about 15 seconds and makes leveling so much better and donít have he problem of the front wheels coming off the ground. Some people have wired the solenoids into the hydraulic leveler system, I know it can be done with Bigfoot and Equilizer systems but I wanted to be able to dump manually at any time. Did the install in about 4 hours and it is one of the best things I have done to the coach.


Looks great. Do you happen to have a part number for the solenoid valve?
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Old 05-04-2019, 09:36 AM   #21
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Looks great. Do you happen to have a part number for the solenoid valve?

Here is the one I used off Amazon but they are all over Ebay and Amazon. Being everything I found was made in China I decided to add the ball valve before the solenoid valve so I could close that line in the event of a valve failure.


https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1
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Old 05-04-2019, 09:52 AM   #22
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If you used a 3 way solenoid valve, you could dump just the air bags and not the tank.
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Old 05-04-2019, 02:14 PM   #23
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Was crawling under mine checking out how to add dumping option and found that I have Barkdale Air Suspension leveling Valves with Integrated Dumps. All I have to do is to be able to add air to dump pilot port on leveling valve and it will dump bag side only. I can either do that with a solenoid operated valve with a switch or a push pull valve on dash. I'm figuring on doing a push pull. That way it will be all mechanical and only need to add one component to system.

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Old 05-13-2019, 01:54 PM   #24
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Got air dump all setup. Installed a VR-10-A rocker air valve switch in dash in the place where the trailer camera switch was, never going to use that anyways (hole needs to be a little bigger). If I ever do need that switch again I just tucked it in dash so all that needs to happen is to cut a hole and reinstall switch. I picked up a primary air supply from under dash to feed supply air to rocker valve switch. Then ran 1/4" air line from delivery port on switch back to a T fitting in rear that feeds pilot valve on each Barkdale leveling valve. Whole project took about two hours to do, and cost me about $170 and works great. Dumps suspension bags, holds air in tanks, is all mechanical so no solenoid valves to crap out. If anything was to go wrong it will default to filling suspension, because it takes pressure to pilot valve to dump the suspension. Secondary air tank holds enough air for almost two cycles then it's empty, secondary tank is the tank that fills suspension.

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Old 05-14-2019, 05:46 AM   #25
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On mine, just the bags
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Old 05-14-2019, 06:10 AM   #26
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Got air dump all setup. Installed a VR-10-A rocker air valve switch in dash in the place where the trailer camera switch was, never going to use that anyways (hole needs to be a little bigger). If I ever do need that switch again I just tucked it in dash so all that needs to happen is to cut a hole and reinstall switch. I picked up a primary air supply from under dash to feed supply air to rocker valve switch. Then ran 1/4" air line from delivery port on switch back to a T fitting in rear that feeds pilot valve on each Barkdale leveling valve. Whole project took about two hours to do, and cost me about $170 and works great. Dumps suspension bags, holds air in tanks, is all mechanical so no solenoid valves to crap out. If anything was to go wrong it will default to filling suspension, because it takes pressure to pilot valve to dump the suspension. Secondary air tank holds enough air for almost two cycles then it's empty, secondary tank is the tank that fills suspension.

Tom C
This sounds great! Although, I can't quite visualize exactly how it works. When you flip that switch and the air suspension dumps, is the system trying to refill? For example, if you dump the bags while parked in front of a garage...if you start the rig and slowly drive into that garage, will the air suspension remain dumped? I would think the system would be trying to raise it back up. Does the air simply bleed out and keep the suspension lowered until you flip the switch back to the normal position?
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Old 05-14-2019, 07:08 AM   #27
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This sounds great! Although, I can't quite visualize exactly how it works. When you flip that switch and the air suspension dumps, is the system trying to refill? For example, if you dump the bags while parked in front of a garage...if you start the rig and slowly drive into that garage, will the air suspension remain dumped? I would think the system would be trying to raise it back up. Does the air simply bleed out and keep the suspension lowered until you flip the switch back to the normal position?
The leveling valves have a built in pilot valve "at least on mine" that when air pressure is applied to pilot valve port, it will dump the air on bag side of the suspension leaving full air in tank. It does not matter if it is running or not because the pilot valve blocks the supply line to the leveling valve while exhausting the suspension side, so you can maintain full pressure in coach in dumped position.

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Old 05-15-2019, 06:06 AM   #28
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The leveling valves have a built in pilot valve "at least on mine" that when air pressure is applied to pilot valve port, it will dump the air on bag side of the suspension leaving full air in tank. It does not matter if it is running or not because the pilot valve blocks the supply line to the leveling valve while exhausting the suspension side, so you can maintain full pressure in coach in dumped position.

Tom C

Tom - Nice job. Sounds like a good install. Have you measured the number of inches the body drops when you dump the suspension bags (the distance to the ground before and after the dump)?

Have you considered how you plan to level your coach now when you arrive at a Site? Will you dump the rear suspension then use the Equalizer Auto-level mode or do a manual leveling process? Since the Equalizer levels-up during it's "dance", it may work well now since you will start at the lowest point to the ground.

I am having a dump valve installed next week at a Freightliner Service Center. This is something Renegade should have done when ordering the chassis. I am going to make this point when I am at the Plant next month.
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