AIR SYSTEM ??

[Roger W Webb]

You might want to consider taking it to a truck shop that can pull it over a pit, find and fix leaks. They can do a DOT test on your brakes, etc. Brake work is fairly inexpensive, as it is what all semi's use. The air system is also not expensive with the exception of replacing the air bags themselves.

FWIW my suspension system will stay 'up' for a long time (days), whereas my brake system bleeds down to zero within 6+ hours after turning everything off. To air up, after I've dumped suspension and zero showing on the brake air gage, to a full 120 psi I give my coach about 20 minutes on the engine compressor.

Lastly, I'd also note that air leaks for other components can cause you problems too. Late this year I had an leak in a small diameter air line that went to the old water purification system under the bed (the filter was not hooked up, but the air was). For what ever reason it started leaking and I could not air up the coach above 60 psi (as shown on the brake gage), the suspension would not air either. I looked/listened everywhere, (outside), crawled under best I could, cursed a lot and finally heard the hissing in the bedroom that disappeared within seconds after shutting off the engine. After a bed disassembly, I turned off a regulator and whala, it aired up.

Roger Webb

Cedar Rapids, IA

91 WL

-----Original Message-----

From: jamiejbrandt

To: WanderlodgeForum

Sent: Mon, Jan 10, 2011 5:01 am

Subject: [WanderlodgeForum] Re: AIR SYSTEM ??

THANKS IT WAS VERY HELPFUL IM GOING TO GET THE PARTS TODAY

DON HOW LONG DOSE IT TAKE FOR YOUR RV TO REACH FULL PRESSURE

I HEAR AIR FROM UNDER THE FRONT RIGHT BEHIND THE GENNY ABOUT IN THE CENTER AND I LOOKED AND I DO SEE SOME KIND OF VALVES BUT IM LEARY OF GETTING TO FAR UNDER THE RV AND SCREWING WITH THEM I NEED TO FIND A COMPANY THAT DOSE THIS I GUESS ANYWAY THANKS AGAIN



JAMIE BRANDT

1990 WB40

FLORIDA



--- In "WanderlodgeForum%40yahoogroups.com", "Don Bradner" wrote:

>

> The switch/valves are Clippard MJTV-4, still available from the manufacturer:

> http://www.clippard.com/store/display_de...sku=MJTV-4

>

> I've replaced both of mine as they leaked in increasing fashion.

>

> Those small leaks, though, won't cause the problem you are seeing. You have a significant leak somewhere, probably in the air bag system, or in the brakes.

>

> You have two air gaugues. One is for the tag-axle air bags, and the other is for the brakes front and rear (two needles). If you shut down, both of those should hold air for a significant amount of time. If they do, then the problem is elsewhere.

>

> When I first got mine, the front air bags would significantly drop in less than 15 minutes. I'm not the one who fixed it, but I'm told that the leveler valve was actually coming apart. Point, though, is that one way or another shutting down when you have full air should show a symptom somewhere.

>

> Don Bradner

> 90 PT40 "Blue Thunder"

> My location: www.bbirdmaps.com/user2.cfm?user=1

>

> On 1/8/2011 at 8:40 PM jamiejbrandt wrote:

>

> >I HAVE A 1990 WB40 AND WHEN I START IT IT TAKES ALONG TIME TO BUILD UP

> >AIR ATLEAST I THINK ITS ALONG TIME ITS NEW TO ME AND IM NOT SURE HOW LONG

> >IT SHOULD TAKE

> >ALSO I HAVE TO PUT IT IN HIGH RPM TO GET IT TO GO UP

> >AFTER I GET IT UP TO ABOUT 115 WHEN I BACK OUT OF DRIVEWAY BY THE TIME I

> >GET IT TO THE ROAD IT DROPS TO 80 THE ONLY TIME IT STAYS HIGH IS ON THE

> >ROAD AT A GOOD SPEED IS THIS NORMAL

> >

> >ALSO THE HOSES AND THE SWITCH PLATE FOR THE GREY AND BLACK WATER DUMP IS

> >LEAKING A BIT NOT THAT BAD DOES ANYONE KNOW WHERE TO GET REPLACMENT PARTS

> >

> >ALL HELP IS APPRCIATED THANKS

> >JAMIE BRANDT

> >1990 WB40

> >FLORIDA

> >

>