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Old 11-02-2014, 02:18 PM   #1
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Hydraulic Leak and Air Leak - 390BH

Well, We are on our 2nd outing in the RV and I just keep learning! Today I left Kissimme KOA and the RV was bouncing like no body's business and I just learned (through this forum) I did not let the air bags inflate! I actually think it was the jacks because I pulled into Target and retracted them again and all was well. Lesson learned: Just make it a habbit to retract-all TWICE!

Now - We just got to Ft Wilderness at Disney and I have two issues I really need help with:

1. I have hydraulic fluid leaking. I saw it under the door where the pump/reservoir are so I opened the door and I had fluid in the tray under the pump/reservoir. I do not see any fluid on the lines, but I see some fluid where the reservoir is bolted to the block. I read somewhere that a lippert pump is known to have o-ring issues but to be honest I have no idea if mine is a lippert or not. I was thinking of removing the reservoir but how on earth would you do that and not spill the fluid everywhere since it is mounted horizontally? Do you have to somehow suction the fluid out before doing it? Do the slides need to be in/out when doing it? I was hoping I could take it off and clean the face (I've read that gunk can cause the seal to break) and put it back. Any advice here?

2. I have an air leak somewhere. Here is what I notice. When the parking brake is engaged the rig is nice and quiet and pressure builds to 125ish. With the parking brake off, wheels blocked, trans in neutral.. I hear a loud rushing sound near the rear of the rig and the air pressure won't rise above 75 on 1 or 2. If the tank is over 75 it will bleed down to 75 too. Also, when I press (and hold) the brake while at a stop light my air pressure keeps falling and I hear a hissing at what seems like the front. These two may be totally different issues but I could use some guidance on how to diagnose the problem. I started trying to figure out the issue because of the gauge leaking down while at a red light. Today I was backing into our spot and after a few brake uses my air alarm came on.


Our last trip we put 5,000 miles on the RV (our maiden voyage) and this trip we are going to do ~2,000. I'm very comfortable driving now, but am learning how little I know about these rigs as i encounter these issues.


Thanks for any help you guys can provide. Love this forum and I find myself searching on here all the time!
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Old 11-02-2014, 03:59 PM   #2
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You might want to look at this thread and see if it is of any help to you.

Air system on coach

Good Luck.
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Old 11-02-2014, 04:10 PM   #3
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On the hydraulic leak, have someone operate the hydraulic slides in and out while you are looking for a leak around the pump. If the pump is leaking it won't take long to find the leak.

You first need to find the leak before you know how to fix it. This problem can be tied together with having to hit retract all twice. If the slides do not show the leak, then operate the leveling system.
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Old 11-02-2014, 08:28 PM   #4
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If you have a air leak that bad you should not be driving it at all. You most likely have a bad brake diaphragm or control valve. You will have greatly reduced braking or could have the brakes lock up due to low air pressure. A air leak this bad would be a out of service for a commercial truck. This could also get you a ticket for unsafe vehicle. get it looked at as soon as possible.
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Old 11-02-2014, 10:20 PM   #5
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rgmiller32 - When it is in Neutral with the parking brake released: It shows pressure at 75psi and I hear a large rushing air sound near the engine bay. Is that abnormal? I didn't know if that was a different issue than the front brake hissing when the brake pedal is held.
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Old 11-02-2014, 10:24 PM   #6
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Knowing that I need to get these things looked at ASAP (esp the air leak) and that I am parked at Disney... how does one actually do that? Call a local mechanic to come out to the RV? Sorry if this is a basic question, but this is my first time being out and needing something looked at. What do I even search for lol?
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Old 11-02-2014, 10:33 PM   #7
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Found a local Mobile Rv Mechanic - called and left a VM.. going to get an appt scheduled. Hoping he lets me be his helper so I can learn!
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Old 11-02-2014, 11:05 PM   #8
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I would think if the air leak is that bad, won't take long to figure out where it's coming from. Definitely wanna get that fixed!!


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Old 11-03-2014, 04:24 AM   #9
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You need a heavy duty truck mechanic with air brake training. Make sure that the rv mechanic has air brake training. What chassis is under your coach? If Freightliner you could call them. If Spartan call them to get a number for a local dealer. Could also find a local truck repair center with road serice.
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Old 11-03-2014, 04:29 AM   #10
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While you are waiting for the service guy to get out to you Google FMVSS 121. There you you find info on the air brake standard and the pre trip test you should do before moving your coach. It will reference heavy trucks. But remember you fall under this if your GVWR is over 26,000 pounds.
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