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Topic: Chassis air leakdown prevention valves (Read 708 times) previous topic - next topic

Chassis air leakdown prevention valves

My tech guru buddy says that my coach should not drop the air the dash gauges show past 60 psi or so.

Something about prevention valves?  Anyone have any input on my 97 u320?

Bob
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Chassis air leakdown prevention valves

Reply #1 –
Quote from: Caflashbob –
My tech guru buddy says that my coach should not drop the air the dash gauges show past 60 psi or so.
Something about prevention valves?  Anyone have any input on my 97 u320?

Bob
Protection Valves on Front and Rear tanks stop at 60psi unless there is a leak in the brake system.
The selected media item is not currently available.Barry BEAM #16014
2003 U320 40' AGDS
Beamalarm, Foretravel technical help and specifications
"Whatever the mind can conceive and believe, it can achieve"

Re: Chassis air leakdown prevention valves

Reply #2 –
Quote from: Barry Beam –
Protection Valves on Front and Rear tanks stop at 60psi unless there is a leak in the brake system.

Both tanks drop identically.  Where would you look?

See I knew Barry knew....

Bob
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Chassis air leakdown prevention valves

Reply #3 –
Quote from: Caflashbob –
Both tanks drop identically.  Where would you look?

See I knew Barry knew....

Bob
I am in the middle of trying to find this out myself. I thought it would be easier to fix this then the leveling leaks but it is proving to be elusive. I have soap sprayed the parts I can reach. I have cleaned the ABS valves of all the road grime but I could not see any bubbles on it. :-(
The selected media item is not currently available.Barry BEAM #16014
2003 U320 40' AGDS
Beamalarm, Foretravel technical help and specifications
"Whatever the mind can conceive and believe, it can achieve"

Re: Chassis air leakdown prevention valves

Reply #4 –
I'll take a stab at this one, , my coach will leak down in to zero in about a week. A while back I replaced the valves on the front tanks, did not do the "wet tank" in the rear. If I were going to continue to look for leaks start back around the compressor, air drier and wet tank "rear air tank", and any fittings in the tanks themselves. Once the protection valves cut the air off at 60 PSI the leak will likely be on the fill side if the tank, you may also want to check the fittings on the air guages and parking brake behind the dash.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Chassis air leakdown prevention valves

Reply #5 –
When checking the parking brake valve on the dash soap it up and then move the handle side to side.  This may be the cause of your leak and it will show up better with slight side pressure on it.


Keith
Keith, Joyce & Smokey the Australian Cattle Dog
1995 U320 SE Extreme 40' WTBI Build # 4780, with a Honda CR-V hopefully still following behind.
Motorcade # 17030
FMCA # F422159

Re: Chassis air leakdown prevention valves

Reply #6 –
Great info.  Thanks guys
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Chassis air leakdown prevention valves

Reply #7 –
My bet is that the step, assuming it is an air driven step, or the air line valve, for airing up the tires, has a small leak.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: Chassis air leakdown prevention valves

Reply #8 –
My air pressure drops fairly fast and I know that the foot brake valve has leaks on all the ports but I cannot get to it to tighten the 90 deg fittings. I think the gen has to come out of the way. I spray it with soapy water and big bubbles all over!!
Hopefully I can get my pit dug in the next month or so so I can access all those hard to reach places. Right now all my time is spent working on Geoffs GV renovating the interior and fixing a few things.
John H
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.
 

Re: Chassis air leakdown prevention valves

Reply #9 –
Obscure corners seem logical.  Love the thoughts.  My kid is a tech.  Will give him a list of places to look.  Keep it coming.  Every place a union occurs its likely to leak. 

Air foot brake

Parking/spring safety brake yellow handle which I remember replacing for a customers coach in the 80's

The notorious step air cylinders where the water pooled in my coach.

Leaks at the gauges themselves.  Good one.  Its always the last place you look.  Why?  Because you stop looking......

I used to be so happy when I turned on my new 80's Foretravels in the morning on my lot and the dash air gauges had not moved.  Made my day.

Sold them with no leaks.  Possible now.  How bad do you want perfect? 

Bob

"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4