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Topic: No air pressure, anything I can try? (Read 1021 times) previous topic - next topic

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No air pressure, anything I can try?
We are stuck in Ocean Springs, MS with no brakes and no pressure. I read about an air governor or pump. I am not a mechanic, but just looking for some help. '95 U300 SE. Thank you.

Re: No air pressure, anything I can try?
Reply #1
Hang on. here's your specs:

  • wayne m
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Re: No air pressure, anything I can try?
Reply #2
if you have no air pressure, your brakes are on.
first thing to check is the air governor.  a $20.00 item, and an easy fix.
good luck. lots of people carry a spare governor

Re: No air pressure, anything I can try?
Reply #3
Update: I tried loosing the nut on the bendix air governor and then turned bolt or screw 360 degrees counterclockwise and then back clockwise. Didn't help. When we shut the engine off, you can hear air leaking. It seems to be coming from the...

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Re: No air pressure, anything I can try?
Reply #4
Air pump belt intact and compressor spinning? Can you hear air leaking anywhere?
Try to find your D2 valve, most likely on compressor smack it with something metal like a cresent wrench, there's also an adjustment screw under the cone shape...

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Re: No air pressure, anything I can try?
Reply #5
A bit more information would help us narrow down the possible trouble area.

Were you driving when you lost air pressure, or is the coach parked somewhere and would not build air pressure when you started engine?

If driving, did you lose air...

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Re: No air pressure, anything I can try?
Reply #6
We just returned from NAC with after a recent brake issue. Best way to describe my concern was: "After building air at startup, Coach lost air while 'feathering' brakes to jockey coach out of home base. Builds air back, seems drivable."

I lost...

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Re: No air pressure, anything I can try?
Reply #7
Paul, is the "pod" you are referring to the brake can or actuator?

Re: No air pressure, anything I can try?
Reply #8
Here's where you are, in the white area, closest to Biloxi. Perchance there's a forum member close?

Re: No air pressure, anything I can try?
Reply #9
So... update: Replaced governor, bypassed dryer and it worked up to 125 psi.  Ordered a filter for the dryer and replaced the old one. cleaned out the valve on the bottom of the dryer after that didn't work. Looks like the dryer is bad. Any idea...

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Re: No air pressure, anything I can try?
Reply #10
My suggestion is to identify the dryer and get a FACTORY (as in the factory that made it) REMAN air dryer.  All valves as well as filters will be new.

Should be a direct bolt-in.

Re: No air pressure, anything I can try?
Reply #11
If dryer is to be replaced, simply remove the whole dryer assembly and carry into any local NAPA parts store.  Tell them you want (as Brett advised) a factory remanufactured unit.  If you are lucky and they have one in stock, remove it from the...

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Re: No air pressure, anything I can try?
Reply #12
A episode like the OP had is a great reason why Brett told me to replace ours after six years, PERIOD!  ^.^d

Re: No air pressure, anything I can try?
Reply #13
Loosen the fittings before you unbolt it
Take pics before you unbolt it.  Ask me how I know ?
  • Last Edit: February 06, 2019, 07:49:09 am by Protech Racing

  • John44
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Re: No air pressure, anything I can try?
Reply #14
While on the dryer subject,what is the rule of thumb time frame after you change yours and start from zero?

Re: No air pressure, anything I can try?
Reply #15
While on the dryer subject,what is the rule of thumb time frame after you change yours and start from zero?
Six years, MAX.

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Re: No air pressure, anything I can try?
Reply #16
Three years for service/replace. If you only operate in the desert SW, maybe a little longer.

My suggestion is alternate between "factory reman" and "rebuild with new filters".  And, if paying labor, the factory reman is a good "always" answer.

...

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Re: No air pressure, anything I can try?
Reply #17
While on the dryer subject,what is the rule of thumb time frame after you change yours and start from zero?
I don't know the "official" answer, but I would think it is not so much time (or...

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Re: No air pressure, anything I can try?
Reply #18
Yup........

Re: No air pressure, anything I can try?
Reply #19
The newer cartridge style is  an  easy annual spin on  replacement.

 I have this one ;New Air Dryer Assembly - Replaces Meritor Wabco System Saver 1200Series...
   I recommend  taking this unit to NAPA and matching up the cartridge before you...

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Re: No air pressure, anything I can try?
Reply #20
My factory manual says 18 months replacement cycle.  I agree it is overkill but the consequences of waiting too long can be catastrophic.

Re: No air pressure, anything I can try?
Reply #21
18 month service interval is probably a very good recommendation for OTR trucks who do many times the miles we do and use a lot more air than we do.

Re: No air pressure, anything I can try?
Reply #22
The newer cartridge style is  an  easy annual spin on  replacement.
Mike do you have part Numbers for the newer cartridge style and will it fit my coach a GV320 2000 or do I have to...

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Re: No air pressure, anything I can try?
Reply #23
Tommy,

Call the company that made your air dryer and ask for a supercession that has spin on filters.  Yes, you could go with another brand, but connecting to the original plumbing may be an issue.

Re: No air pressure, anything I can try?
Reply #24
Call the company that made your air dryer and ask for a supercession that has spin on filters.  Yes, you could go with another brand, but connecting to the original plumbing may be an issue....


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