[glen]

Unless you have defective protection valves or check valves the loss of aux air is not related to the loss of brake system air.

To effectively repair the leaks, drive south.

[Archived]

The cold always brings out the leaks, water, coolant or air. On the aux side all you can do is check each item, not a fun job in the cold.

Mine leaked suspension air left side (leans) more when cold. Could be a bag, fitting or Norgren. As I mentioned on the other thread, even after new bags and 5 ports, it ended up being the 3 port above the tag and internal, no external leak. So it could be any number of things. Air it up and cycle the level low positions to move air through the system.

I know you’re working, so heading south is not an option…

[Archived]

Tom,

Thanks. I will air up and cycle everything tommorow and see if that helps. Worth a try.

Will head south in 2 weeks.

[glen]

Make sure you drain it in front steer compartment.. prob just cycling everything wll get it loosened up.. C old weather tightens me up too!!
If it don’t work drain and repeat sometimes the shock/change breaks the bond.

[Bill]

Andre,

For what it’s worth, I made it a practice to raise the bus up to its highest level, drop it to its lowest, and return to ride height every couple of weeks or so, just to go through the full range of motion. The next time I would drop it all the way down, raise all the way up, then down to ride height.

May have been a complete waste of time……or it may have kept everything moving just enough to battle any minute amounts of corrosion or moisture that may have been forming.

I also on occasion worked all the Level Low rocker switches back and forth with the system off just to keep the contacts clean.

I have no clue as to whether any of this made an iota of difference to anything, but I was always concerned that if there was a “problem” that I wanted to find it during one of my exercises and not as I was about to travel.

[needtocamp]

30 hours ago I started the engine and used the level low to move the bus up and down and re leveled. Also released and set the parking brake several times, pumped the brake pedal 6 or 7 times. Seems like it helped. The secondary air only dropped 5 lbs and then stabilized. The Aux air dropped to 75 LBS and stopped there. So I still have a leak but not as bad as it was. So Paul’s post above had the right idea. At least it sure seem to help.

[AL]

check the tag lift valve it’s on aux air and parking brake valve it’s hook to secondary and primary tanks they should be beside seat on left they can leak from fittings or inside exhausting air out bottom of valve if they are old I would replace them easy fix get them at just about any parts store ….. Hope that helps or it might be the gauges at dash or where they hook into system in steering bay they leak too…

[Archived]

Peter

Thanks I will add those 2 items to the list to replace as soon as I get home in 3 weeks.

[Alvie]

No problem , I replaced all norgrens , brake hoses and chambers , ride height valves and still had a leak , fixed gauges with comp fittings on both ends , and replaced tag lift valve and parking brake valve , and leaks stopped completely on all air gauges , if you have air door lock on passenger side that valve beside seat can leak too , mine was I put new one in all good now , hope that helps .. My hole coach is compressed fittings , not one push in fitting on coach that will also help….

[Archived]

Update

Back in Florida and the warm weather helped solve some of the issues. I also replaced the two small airbags on the fan and 3 push on air fittings on the hoses that fed the fan airbags. As of right now I am only losing about 3 lbs of air in 24 hours on the aux air. The primary and secondery air systems are not losing any air.

So I have decided that warm weather helps a LOT. I tried to find what might be a small leak in the right rear, but no soap bubbles so far.

[Archived]

On the AUX air side have you looked at the check valve on the air compressor. Chasing air leaks and speaking to Marathon tech service, Item number one on the AUX side is the Thomas air compressor check valve.

Heat is the enemy for longevity and suggested replacement is every 2 years.

Another check valve is located on the AUX air storage tank. Not on the 2 year hit list but one that should also be

changed.

[Dick]

AL are you talking about aux air tank on the prevost side , or the aux air tank converter put in???

[Peter]

Peter, this tank is on the converter side. On our Marathon it’s bolted to the floor under the drivers seat.

AL

[Ken]

Thanks AL , I don’t think mine on the prevost aux tank has check valve just a pressure protection valve thought maybe I was missing something , because I changed all my check valves thought maybe I missed one….

[Charles]

Thanks Guys, I am leaving Florida tommorow to head north, Durham N.C. I will try some of the tricks, such as working the level low and parking brake ever so often if leaks plauge me, I am pretty tight right now auxilary runs ever three days. Will be parked in the same place outside for 7 weeks, so these ideas will be put to use. Seems like a major cold front is heading that way the first of the week. will be below 0 at home in V.A. but the Durham area should not be near that cold, say 15 or so, the Webasto and water bay heaters will keep it toasty inside, hope to be back in Florida by the first of March. Guess I will put my shorts away for a while! Gary