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Old 11-02-2015, 04:42 PM   #1
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Brake or Bag Air Leak?

Our coach was purchased with a known slow air leak. When it sits for a couple of hours the front end goes all the way down. It takes 4-5 min to air the system back up. Yesterday, while running a wire under the coach from front to back, I noticed an air line leaking to the front air brake. It was pretty loud. Could that be the reason the front bags are going down or is that a separate leak?
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Old 11-02-2015, 04:45 PM   #2
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That could very well be the culprit. Either way it needs attention soon! I just spent a great deal of time under mine with a spray bottle of soapy water. I found a total of 7 leaks. I thought I might have one or 2 but not 7!
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Old 11-02-2015, 05:02 PM   #3
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air leak

I think you have two separate issues the air bags are controlled at each front wheel by a level valve so the air bag leak is probably between the valve and air bag or the bag it self. My coach air gauge has to needles green is suspension orange is brakes if yours is equipped that way park on a level spot pop a cold one and watch the gauge mike
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Old 11-02-2015, 05:43 PM   #4
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I think you have two separate issues the air bags are controlled at each front wheel by a level valve so the air bag leak is probably between the valve and air bag or the bag it self. My coach air gauge has to needles green is suspension orange is brakes if yours is equipped that way park on a level spot pop a cold one and watch the gauge mike
If you have 2 air gauges I would almost bet that they would indicate front air and back air pressure. The suspension system probably uses the back air which is why you would see one of that gauges fluctuate with the air bags.
I have never seen an air brake system with only one gauge.
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Old 11-02-2015, 09:45 PM   #5
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I'm wondering why there would be air in the line to one of your front brake chambers, with you under the coach, and I assume no one pressing the brake pedal .
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Old 11-03-2015, 09:05 AM   #6
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I'm wondering why there would be air in the line to one of your front brake chambers, with you under the coach, and I assume no one pressing the brake pedal .
It was leaking from a frame mounted, threaded air line coupler that went to the front right air brake.
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Old 11-03-2015, 09:07 AM   #7
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I just spent a great deal of time under mine with a spray bottle of soapy water. I found a total of 7 leaks. I thought I might have one or 2 but not 7!
How do you address the leaks, teflon tape or teflon thread sealant?
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Old 11-03-2015, 09:23 AM   #8
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How do you address the leaks, teflon tape or teflon thread sealant?
All were the result of the line leaking at the fitting union. Replace the fittings. Pretty easy, just need the old one out to go match it at the truck supply shop. Mine were the quick release kind of fittings, which allow the hose to be re-used with out cutting the end off; though I did cut a tad off each end to start with a fresh end.

The hardest part was getting underneath! Don't disconnect a fitting without releasing the air without getting out form underneath underneath either. (Assuming the air suspension lines are in question).
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