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Old 03-29-2015, 05:36 PM   #1
Join Date: Jul 2011
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Wabco Air Dryer

I just changed the air dryer on MH, long past due. While under MH, and looking for what I call a leak, getting on my car, right side, can not find a leak, but it looks to be coming from air dryer, things behind it are real oily and nasty black, you think that's it

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Old 03-29-2015, 05:41 PM   #2
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There is usually a breather hose under there that is where it comes from

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Old 03-29-2015, 05:42 PM   #3
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If you have not changed the air dryers filter, that would do it. If you see an oily residue on the floor when your compressor pops off under the air dryer...it is past time to change it.

If you dryer filter was that bad, you will need to purge your air tanks as well. You do not want any moisture getting into your air brake system. That can really get expensive.
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Old 03-29-2015, 07:00 PM   #4
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If the oil is coming out of the air dryer discharge port, that oil is coming from the compressor .

The compressor may be going bad, as they have piston rings in them.

Another thing to check is the compressor intake. Some have filters and others hook into the engine air intake. If either is restricted, the compressor will pull oil past the rings.

Last but common, is that the compressor is cycling constantly, due to a leak in the small line, between the governer unloader port and the air dryer, unloader valve.

If the air dryer blows off every few minutes, while sitting still, there is a leak.

The air dryer should not blow off, unless you run the air down to 90 lbs or so and then only once it gets back to 120 lbs .

Good luck
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