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Old 07-06-2011, 09:09 AM   #1
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Do you have an air pressure gage?

My owner's manual talks about bleeding the air pressure down to below 60 psig, but there is no air pressure gage. Hmmm... I have just been bleeding it WAY down to be sure.
But, I was wondering.... Does your MH have an air pressure gage installed at the dash? Or, have you installed one yourself? Is it worthwhile doing?
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Old 07-06-2011, 09:24 AM   #2
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My rig came with air gages for the primary and secondary systems... mounted in the dash. Although I kind of look at them in a binary manner... air is either OK or not ok... I do think I would be nervous without them.

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Old 07-06-2011, 09:59 AM   #3
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I have guages on my HR to check on the airbags supporting the coach and the brake system. I feel more secure knowing the air pressure.
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Old 07-06-2011, 10:04 AM   #4
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I've never seen a coach with air brakes that did not have gauges for front and rear tanks. Is yours perhaps air suspension only (hydraulic brakes)? Or are we talking about some other air pressure?

Nor have I ever heard of a need to bleed pressure down in an air system. Mostly it is the opposite - need to keep pressure above 60 psi to keep the park/emergency brake from activating. Can you tell us more about what your manual says? And why?
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Old 07-06-2011, 03:55 PM   #5
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As part of the , air brake / air compresor recovery testing reccomended procedure, droping the pressure tests the low air warning signals, and timing the recovery to compresor cut out gives an indcation of comp. condition. Not realy required if your leveling system bleeds your air bags. As your start up air pressure is already low.
If your air system needs more than 2 min.. to build from 60 to 90 psi. there is something wrong.
Ditto, to Gary's, statement about gauges, It's federal law in Canada. Air Brakes = Air Gauges.
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Old 07-06-2011, 04:30 PM   #6
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I agree with all of the above comments... the bleeding of the air pressure is (as previously mentioned) a test procedure for warning alarms, your emergency brakes & a test for your compressor.

I cannot believe that your Coach would have air brakes & not have gauges for your primary & secondary tanks. In most Canadian Provinces you must have an air brake endorsement on your drivers licence and this involves taking a certified air brake training course. Regardless, of the requirement.... In my opinion, everyone operating an air brake equipped Coach should take this course so you can understand how something this critical to your safety actually works.
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Old 07-06-2011, 04:41 PM   #7
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Quote:
Originally Posted by Gary RVRoamer View Post
I've never seen a coach with air brakes that did not have gauges for front and rear tanks. Is yours perhaps air suspension only (hydraulic brakes)? Or are we talking about some other air pressure?

Nor have I ever heard of a need to bleed pressure down in an air system. Mostly it is the opposite - need to keep pressure above 60 psi to keep the park/emergency brake from activating. Can you tell us more about what your manual says? And why?
On some MHs with air suspension, the only leveling system is hydraulic. Normally you would dump the air bags and tanks first to lower the coach. If you don't do this first, your jacks may not have the extension required to get a good level. POGO, the OP, did not indicate whether he had air leveling or not.

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Old 07-07-2011, 07:23 AM   #8
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This coach ('04 Neptune PDQ 36') is on an R4R chassis and has the normal 4 airbags thus the mention of an "air" system......
The brakes and leveling system are hydraulic, not air... There was no option for air brakes/leveling system in '04.
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Old 07-08-2011, 05:44 PM   #9
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No, actually my coach DOES HAVE air brakes, and hydraulic feet with air bag suspension. And, there is an air chuck fitting in the left front basement compartment. (I'm not sure what that is to be used for.)
I have been holding the brake and using the air dump switch to release the air pressure when I arrive and get ready to lower the three leveling feet, but I don't know what the air pressure reading is.
I do not have the owner's manual in front of me right now, but it says to release the air pressure below 60 psi before lowering the feet. Otherwise the coach might sit too high and the hydraulic feet might not be able to extend down enough.
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Old 07-08-2011, 06:33 PM   #10
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No, actually my coach DOES HAVE air brakes, and hydraulic feet with air bag suspension. And, there is an air chuck fitting in the left front basement compartment. (I'm not sure what that is to be used for.)
I have been holding the brake and using the air dump switch to release the air pressure when I arrive and get ready to lower the three leveling feet, but I don't know what the air pressure reading is.
I do not have the owner's manual in front of me right now, but it says to release the air pressure below 60 psi before lowering the feet. Otherwise the coach might sit too high and the hydraulic feet might not be able to extend down enough.
Pogo,

I think that air chuck is there to pressurize your tires. It doesn't work very well unless the engine is running. If your tires require a 100# or more, even with the engine running, it is a PITA. Concerning the lack of an air pressure gauge, 60psi is not critical. When you dump the air you can usually tell when the pressure is low enough because your coach stops lowering. Don't you have an air pressure gauge on the dash? That indicates the pressure for air brakes and bags. When I had a system like yours I always pumped the brakes to speed up the depressurizing process.


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Old 07-08-2011, 07:36 PM   #11
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the air chuck is there for a tow truck to be able to release your air brakes but will work to air tires
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