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Old 07-01-2014, 01:45 PM   #1
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Using Air From Coach to Inflate Tires

I was wanting it inflate my Tires to 125 psi. I am currently sitting with level pads down and air bags deflated. Will it work to start engine and hook up air hose to coach air outlet, or does the air bag dump have to be in inflated position? I would like to check and inflate tires the day before pulling out on the road.
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Old 07-01-2014, 02:27 PM   #2
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Should be able to use the air from your coach. Mine has a manifold behind the hood where I can connect a hose. My air tanks can get up to 175PSI so watch the pressure.
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Old 07-01-2014, 02:35 PM   #3
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125 psi may well be more than your coach system will put out. Most coach compressors engage at about 90 psi and disengage at about 120 psi. If you will regularly need air at greater than about 110 psi, you will be better off just buying a 150 psi pancake compressor, available from any number of outlets-- HF, Lowes, Home Depot, Amazon, etc. It will be small enough to carry in the basement, strong enough to air your tires, and useful for numerous other things you may encounter.
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Old 07-01-2014, 02:39 PM   #4
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[QUOTE=mchero;2118470]......My air tanks can get up to 175PSI .....[\QUOTE]


mchero, what chassis is that? 175psi is a lot of air..
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Old 07-01-2014, 03:45 PM   #5
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On my experience, most coaches wont give you 120 plus, and you're burning diesel and maybe running your engine at idle for a relatively short time, where it doesn't get properly warmed up

I concur that a small compressor that can serve up 150 is a better option

Using the coach air is an option when other sources are not available
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Old 07-01-2014, 07:24 PM   #6
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RV Geeks Has Answered This Question For You!

I just swear by these guys! I don't even have a rig yet and I'm already geared up to follow their recommendations!

This short video on their YouTube channel describes how they were able to utilize the air brake system to properly inflate the rig tires. It contains a link to the "original" video, showing all the steps.
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Old 07-01-2014, 10:46 PM   #7
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X2 on the RV Geeks. I made the pressure monitor for about $15 with parts from an auto supply company - works like a charm.

The question I have is why do you need 125 psi in the tires - you must be carrying a very heavy load?
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Old 07-02-2014, 12:55 AM   #8
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Originally Posted by Ret Syntst View Post
The question I have is why do you need 125 psi in the tires - you must be carrying a very heavy load?
X2, that's what my tires are rated for but I only need 95 front and 90 rear.
Do you have your coaches weights . Over inflation will make your coach float down the highway.
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Old 07-02-2014, 08:35 AM   #9
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Quote:
Originally Posted by GraciesDaddy View Post
I just swear by these guys! I don't even have a rig yet and I'm already geared up to follow their recommendations!

This short video on their YouTube channel describes how they were able to utilize the air brake system to properly inflate the rig tires. It contains a link to the "original" video, showing all the steps.

This is the method I use too, and love it! My coach only provides 125 PSI of air, so I could never inflate a tire to 125 PSI. That's a LOT of pressure! What size tires do you have that requires that kind of pressure?
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Old 07-02-2014, 10:09 PM   #10
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I have yet to see a motor home that required 125 psi in the tires! That may be what is printed on the side of the tire, but that does NOT mean that's how much air you put in it.

You need to weigh your coach (each wheel separately) and then inflate the tires based on the weights on each axle. You find the pressure from chart from the tire manufacturer. I'll bet it won't be anywhere near 125 psi.


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Old 07-02-2014, 10:11 PM   #11
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I currently have 100psi in the tires and the tires show 125 psi on the side walls. The tires are Goodyear and the Coach is a Discovery 40E. You all have me thinking that the current 100psi is OK., and I should leave well enough alone.
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Old 07-02-2014, 10:29 PM   #12
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You can go online to the Goodyear website and download an inflation chart for your size tires . Then until you have an opportunity to have your coach weighed , loaded for travel , with a full tank of fuel. Assume your coach is at max axle weight and adjust your tires to the pressure on the chart.
Every coach has a slightly different weight and each owner carries different stuff. So each person's inflation will vary.
JMHO: If you have been traveling with the current inflation and your only going a short distance , leave the pressure where it is, until you have a scale weight, preferably 4 corner, because you may need different pressure side to side too.
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Old 07-02-2014, 10:37 PM   #13
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Originally Posted by rambler5860 View Post
I currently have 100psi in the tires and the tires show 125 psi on the side walls. The tires are Goodyear and the Coach is a Discovery 40E. You all have me thinking that the current 100psi is OK, and I should leave well enough alone.
Do not leave well enough alone. That's what I did until I saw the light, and me with 40 years of automotive knowledge and 20 years of towing experience. Read this thread:

The right tire pressure - WOW!
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Old 07-03-2014, 06:15 AM   #14
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I used to run 120 psi in all of my tires and it was like riding the flintstonemobile down the road. (120 is what the sticker inside the coach recommended) Every bump in the road rattled my teeth, and I believe I ruined a tire due to too much psi.

I finally got a four corner weight done and ended up reducing the front to 100 psi and the duals to 90 psi. In actuality, I could probably go a little lower, but I left a bit of cushion in my numbers to account for load fluctuations trip-to-trip. Describing the difference in ride as night and day is an understatement.

Do yourself a favor and go to a moving company and get yourself weighed. The one I went to didn't even charge for doing it.
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