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Old 08-16-2022, 03:48 PM   #1
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Full air drain procedure

According to my chassis manufacturer, (Spartan) I should be doing a full air drain at least twice a year. I occasionally pull each lanyard and have never had any moisture come out. I'll admit that I'm a bit nervous draining the tanks.
So, how many of you completely drain your air tanks?
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Old 08-16-2022, 04:10 PM   #2
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On my 2005 Monaco Diplomat, they installed a brass 1/4 turn drain valve at the rear next to the hitch and one next to the generator. About twice a year, I would open them up and drain the tanks. They were VERY easy to access.

On both my 2014 DS and my 2019 DS, I might drain them once a year when a do the chassis lube. With that said, I live in California where it is very dry. I've never had an issue and have never had any water in the system.
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Old 08-17-2022, 04:09 AM   #3
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I was going to say I would never drain the air tanks completely until I read this from RV Tech Library from a 2010 Spartan seminar: https://www.rvtechlibrary.com/chassis/airdrain.php

The short of it is Spartan wants a completely drained air tank because it will test the check valves. My guess is these check valves are there to prevent air loss from the rest of the braking system - you should verify all this - just my guess. But a good idea if I am right.

Just park flat, chock plenty of tires. The park brake should not release if the tank check valves keep air to it up. (My guess again).

I am sure a knowledgeable Spartan operator will set this straight.
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Old 08-17-2022, 04:24 AM   #4
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Spartan Mountainmaster chassis here. I do it when I change the oil. I have never seen any moisture either.
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Old 08-17-2022, 06:22 AM   #5
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Air is required to "release" the brakes. 0lb air, brakes set. 120lb air, brakes will release.
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Old 08-17-2022, 07:00 AM   #6
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Quote:
Originally Posted by FloridaSon View Post
I was going to say I would never drain the air tanks completely until I read this from RV Tech Library from a 2010 Spartan seminar: https://www.rvtechlibrary.com/chassis/airdrain.php



The short of it is Spartan wants a completely drained air tank because it will test the check valves. My guess is these check valves are there to prevent air loss from the rest of the braking system - you should verify all this - just my guess. But a good idea if I am right.



Just park flat, chock plenty of tires. The park brake should not release if the tank check valves keep air to it up. (My guess again).



I am sure a knowledgeable Spartan operator will set this straight.
Bad guess, air releases the parking brakes, springs hold it on. No air, no roll.

No chocks needed to drain air system.
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Old 08-17-2022, 03:29 PM   #7
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We just left Spartan, my tech indicated that if traveling on staying in humid areas for me to drain my tanks at the least once a month, saying that was a lot of water in my system


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Old 08-17-2022, 05:59 PM   #8
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Quote:
Originally Posted by Bears Dad View Post
Air is required to "release" the brakes. 0lb air, brakes set. 120lb air, brakes will release.
You are right, thanks.
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Old 08-17-2022, 08:00 PM   #9
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Per big Mike at Spartan, he gave me the following instructions this year at the FMCA Tucson Rally:
Start with the Silver, then Green, then red.
Lanyard colors may be difficult to see and may be covered in undercarriage spray.
Once I identified, I used 1 small white zip tie for the silver, 2 for the green and 3 for the red. On each zip tie I left a loop so you can easily see and identify without crawling under the chassis.
An old broom stick or pole with a hook works great to pull the lanyards.

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