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Marathon Air System vs. Prevost
I’ve attached a picture of my Marathon Aux shut-off valve & lines. When I was at Prevost, they said they Marathon tied into some of the Prevost side (look at the photo and the orange connections on the right are Marathon which they said were on the Prevost side). I thought this valve somehow totally separated the Marathon side from the Prevost side?
The Prevost guys also stated that their F/R brakes and Aux air lines are connected together and the gauges can go down together when the bus is shut-off; however, there is a pressure protection valve that automatically shuts-off the brakes from the Prevost Aux side at between 60psi-90-psi, depending on the bus.
For example, the leaking air line behind my dash, which is now fixed, was to the F/Brakes, but all three of my gauges leaked down at the same rate before the compressor kicked on at 105psi. Although the Aux leaks down in around 24-hours, the brakes have now held at around 75psi for several days (and should hold indefinitely according to other posts here).
All DOT Brake checks showed no PSI loss. Does this sound about right?
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7 Replies
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Tim
That’s what it looks like but where do those 3 lines go? It look’s like an add on.
Turn your Aux comp off at the breaker and let the air out of the Marathon Aux tank and make sure the Prevost side air pressure is up and see what works in the house.
You should be able to chase down where those lines are going to.
Later
bv -
You’ll find that those lines were added by Marathon using Prevost aux air and go to places like the seat. I only have 2 and don’t know where my second one goes, it’s buried in the bundle. Everything else is isolated by the yellow valve. Use Bernies suggestion and you’ll have the answer.
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Thanks Guys, I isolated the leak to the air slide. It’s actually the valve that leaks and it only leaks when or if I use the slide. Tested it both ways &!it does not leak when not in use. Marathon guys say it’s a valve & if I don’t use it much to not worry about it. The Aux gauge went down before my eyes when I tried to retract it. The footrest is also on the Prevost side but no leaks there. I can’t figure out where the 3rd line goes unless it’s to the gen air bags which remained aired up, but I understand they have a check valve in them so I’m not sure if it’s the 3rd line or not. My air bed & pocket door did not work when I popped the DC breaker so that tip certainly helped me. Thanks again…
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Your gen is on the Marathon side. Real surprised your floor slide and footrest is on the Prevost aux, mine is not.
Air slide regulator is on Marathon side and also feeds footrest on mine. -
Marathon is not alone in having house items on the Prevost side. I have some house items on the Prevost manifolds as well. With respect to the floor slide I can fully understand why that likely should be on the Prevost side.
One of our members was hurt as a result of entering his coach, and by accident hit the floor slide switch in the entry way. The slide came out and knocked him backwards off the coach steps. Moving it to a “key on” manifold on the Prevost side prevents accidental operation unless the coach is running.
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That’s what Marathon did, the floor slide is key on, but Marathon aux air.
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Tom, My air slide is on Prevost aux side since it worked when I popped the marathon aux breaker & drained the marathon aux tank. The other two marathon items I forgot about are my toilet (marathon aux) & air horn (Prevost aux).
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