Air leak

[dthollis1961]

Gardner,

On my '78, what you are talking about was a manifold that sent air
to the steps, horns, tire inflator hose etc. There is a safety
valve on that manifold that shut the air supply off to these non-
essential accessories when air pressure drops to 65 pounds so your
brakes will still function . That's why your gauges stop dropping
at 65. Also on that manifold is the low air pressure warning
sensor. I replaced both the safety valve and the low air
sensor...one or both were leaking. Common parts and less than $10
each at the big truck store.

My 78 had an electric vacuum pump for the cruise mounted in the RF
compartment.

David Hollis 84 FC35 Springfield,IL


--- In WanderlodgeForum@yahoogroups.com, "Gardner Yeaw"
wrote:
>
> I have an air leak in the front of my 78FC33. Lying on the ground
> and reaching up in the left front there is what looks like a
> distribution valve. It has at least two thin black hoses attached
> with screw on caps. When I shut off the coach it leaks for a few
> minutes then stops. The brake tanks keep about 75 lbs of preasure,
> but the step stops working.
>
> There is a tube that is designed to have a rubber hose sliped
over
> it on one side of the valve, I can't see it, but that is where the
> air is leaking from, It seemed odd that there would be a slip on
> connection when all the others are the standard black tube with a
> screw on connector.
>
> Does anyone have any idea what this valve may be for? I had
read
> that the cruise control used air passing over a venturi to
generate
> vacuume, could this be it?
>
> Thanks
> Gardner
> 78FC33
>