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Old 07-15-2016, 05:15 PM   #1
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Air tank drain valve location

I have a 2001 Inrtigue. I know that the air dryer works, but I can't find the vales to drain the air manually. Does anyone know where they are located?
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Old 07-15-2016, 07:53 PM   #2
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I have a 2001 Inrtigue. I know that the air dryer works, but I can't find the vales to drain the air manually. Does anyone know where they are located?
Look under the front end on the driver's side. There are 3 valves right together
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Old 07-16-2016, 01:32 PM   #3
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On my 2001, I use the bay directly under the driver, reach over the wall above the windshield washer fluid tank, and they are right there.
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Old 07-16-2016, 02:06 PM   #4
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Thanks, I found them. They are kinda hidden, behind that wall.
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Old 07-16-2016, 04:02 PM   #5
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While we are on this, can anyone tell me why there are three valves?

When I was under the coach last, I physically only saw two tanks.


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Old 07-16-2016, 07:30 PM   #6
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While we are on this, can anyone tell me why there are three valves?

When I was under the coach last, I physically only saw two tanks.


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I think they are for front brakes, rear brakes and leveling system.
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Old 07-16-2016, 07:33 PM   #7
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Wet Tank, Primary Tank and Secondary Tank


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Old 07-16-2016, 07:50 PM   #8
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I many cases, they use a dual tank.

The smaller section of the larger tank would be the wet tank.

If you look close, you can see the seam 1/3 down the tank, where the partition is.
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Old 07-16-2016, 10:06 PM   #9
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Ok, I think this is starting to make sense. Could both tanks have partitions? That would make 4 tanks in two.

1) wet tank
2) main tank or rear brakes
3) secondary or front brakes
4) accessory tank for air ride and horn.

When I drain all three valves should the coach remain at ride height?

Thanks



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Old 07-17-2016, 03:50 AM   #10
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I doubt there is a 4th tank. The accessories run off the secondary tank with a protection valve that locks them out below 60 psi. That is to conserve the air for stopping in a system failure.

The suspension air is contained in the bags by ride height valves. Draining the supply side should not drop the ride height.
That's not to say the height won't drop, due to a leak or malfunction, so don't be between moving parts while draining the air.
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Old 07-17-2016, 08:46 AM   #11
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Originally Posted by bneukam View Post
Ok, I think this is starting to make sense. Could both tanks have partitions? That would make 4 tanks in two.

1) wet tank
2) main tank or rear brakes
3) secondary or front brakes
4) accessory tank for air ride and horn.

When I drain all three valves should the coach remain at ride height?

Thanks



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Like twinboat said. Highly unlikely that you have 4 tanks up front. There sometimes are smaller accumulator tanks in he rear for the air bags. My coach does have a small accumulator tank in rear for the air bags.
If you really want to see what each tank is feeding you might want to get a diagram from your chassis mfgr. I did that to help troubleshoot issues.

Here is how mine is setup.
Wet tanks all air goes in here first. Then it feeds both the primary and secondary tanks. Check valves between all the tanks so one leak does not drain all tanks.
My primary tank feeds the rear brakes.
Secondary tank feeds front brakes and air bags.
Parking brake release is fed from a balance valve from both primary and secondary tanks.


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Old 07-17-2016, 08:33 PM   #12
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From the manual, Section 4.3
AIR TANKS
"Dry air is delivered to the "wet tank" and distributed to the primary,secondary, and auxiliary tanks. Four air reservoirs are contained in two tanks. From the wet tank air reaches the primary reservoir (green hoses) which supplies air to the rear service brakes. From there, the air is disseminated equally to the secondary reservoir (red hoses), which provides air to the front brakes, and the accessory reservoirs, which provide air to the front and rear suspensions.

Each reservoir has a check valve at the supply port, maintaining pressure for that reservoir in case failure occurs in another.

Accessory Air System
The suspension air system utilizes regulator valves in the air tank to control air pressure and to prevent pressure loss to the brake system in the event of an air spring failure. The pressure protection valve is a one way, pressure controlle check valve. The valve closes, trapping air in the reservoir when the reservoir pressure drops to approximately 65 psi. This feature prevents parking brake lock-up if an air spring is punctured,allows the motorcoach to be driven to a repair facility, and prevents loss of service brakes.

Air Line Color Code
Green..............Primary Brakes (rear)
Red.................Secondary Brakes (front)
Brown..............Parking Brakes
Orange.............Air Governor
Black................Accessories and Air Bags
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Old 07-17-2016, 09:52 PM   #13
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Don,
Thanks for the info. It's weird that our coaches are the same year and model, but yet the wording, and the sections in which they are located are different.

I didn't think they would put brakes and suspension on the same tank.

Will be moving into a storage condo soon, and will finally get the chance to do some exploring.


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Old 10-22-2016, 08:06 PM   #14
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Steve, is the wet tank the same as the air dryer? Thanks in advance....
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