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LarryinID · 01-13-2022, 04:05 PM

Another reason to prefer my gasser.

saduncan1 · 01-13-2022, 04:37 PM

Unloader valve are repairable, most truck shops can repair them and adjust the pop off pressure , I would make some calls first!!!! Also much cheaper!!!

Roland Trombley · 01-13-2022, 04:52 PM

The new dryer was to arrive today, but was delayed due to weather.
I moved the RV to the dump station today and did a loop aro7nd inside the park. Pressures hovered around 85 to ninety while maneuvering and returned to 120 when I got back into our spot.

Roland Trombley · 01-13-2022, 04:56 PM

And I am apprehensive about heading straight into Atlanta l75 traffic when we do get back on the road.

twinboat · 01-13-2022, 04:58 PM

Quote:

Originally Posted by rodekyll

A couple of random notes:

There are no "standard" air couplers. I tried to find out from several tow truck guys, even, what coupler they use to connect to my coach and they couldn't give me a spec. I've got a half-dozen different quick connectors in my toolbox, and none fit.

I got around it by pulling the existing (but unknown) female connector from the coach air line and reinstalling it on a Tee. The other side of the Tee has a type "C" female connector, which plugs in to my aux compressor and all my air tools. That way the problem is solved and the tow truck guy has his air port, and I have access to the on-board compressor for my air tools. For my emergency purposes, the pancake compressor was in the basement with a hose running forward to the Tee. I powered it from the basement freezer outlet, which runs off the inverter.

The other note is that when I did the air fitting Tee to suppliment my compressor, I was in a similar situation (might still be there) as the OP. I found that the (Freightliner) dash control module was bad. I forget the name of the controller, but it sends signals to the dash gauges. It was throwing all sorts of strange pressure readings and setting off the low pressure alarms and lights as I went down the road (no brakes in use). Even with the aux compressor running I was getting constant pressure alarms. It was quite unnerving.

When I got to a good place, I checked the actual air pressures with a gauge and discovered the gauges and alarm were the problem, not my air supply. I tinkered with u-toob fixes for the failed pressure sensors but was unsuccessful. When I replaced the controller (ebay), the dash gauges agreed with the test gauge and the alarm started behaving. I haven't been on the road enough since to see if my compressor's recovery time is good or not. What I'm saying is that I could have other issues in addition to the dash controller. I'm not assuming it's completely fixed yet.

The OP stated that the brakes locked up. That's not a guage control issue.

twinboat · 01-13-2022, 05:00 PM

Quote:

Originally Posted by LarryinID

Another reason to prefer my gasser.

Very helpfull.

Roland Trombley · 01-13-2022, 05:14 PM

One of the technicians that looked at this said the unloaders were sticking in my compressor, and that the only solution was to replace the compressor.
1999 ISC Cummins 8.3 liter

johnmontgome · 01-13-2022, 05:18 PM

The descant I've seen is little BBs and They can go anyplace and cause all kinds of problems. fortunately for me mine were all confined to the dryer and I was able to get them all out and rebuild the dryer.

rvtechboss · 01-13-2022, 05:25 PM

I recently diagnosed the same type of complaint, there is a bi directionl valve that’s plastic usually located under access behind brake pedal, bunch of brass fittings in plastic , soap it down with engine/ compressor running, after you bleed the tank, tanks

G Hawthorne · 01-13-2022, 06:07 PM

I carry an air compressor and hoses to connect to my Monaco for this purpose. I will power the air compressor via by generator. I also carry 2 air lines for the brakes with a coupler. The real lines are 4 feet and the front are 2 feet, so I carry 2 two foot hoses and a coupler. A friend was stranded in the desert all day because he broke an air hose on a piece of tire in the road

mackwrench · 01-13-2022, 06:15 PM

There's a fairly easy way to check the unloader valve besides replacing compressor.

I don't know how far you have to drive to get home, but a few here seem to be ok with plumbing up a 110v compressor and going.
Perhaps pick one up at home Depot or something and rock on home where you can take the time to diagnose it.

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mackwrench · 01-13-2022, 06:21 PM

OP, be safe..... nasty weather gonna be in ATL and north Sunday night, be awesome to get away from there!

96 Wideglide · 01-13-2022, 06:24 PM

Quote:

Originally Posted by mackwrench

There's a fairly easy way to check the unloader valve besides replacing compressor.

I don't know how far you have to drive to get home, but a few here seem to be ok with plumbing up a 110v compressor and going.
Perhaps pick one up at home Depot or something and rock on home where you can take the time to diagnose it.Attachment 353755

I wouldn't take on any mountain passes, but if I had a few miles of level roads, I'd go for it, with the pancake compressor plugged in, gen running.

Mark 7 · 01-13-2022, 06:24 PM

Another thing everyone who has air brakes should learn to do is to "Cage" the spring brakes. I have done that many times in my 40 year career with my work truck and trailers. IF you still have air, but a blown pancake in the spring brake chamber it can safely get you off the road to somewhere you can have the "can" replaced. Your service brakes will still function.

I carry a new caging bolt in my tool box as the ones on the side of the assembly are often corroded and a PITA to deal with.

NEVER take a chamber apart unless you know what you are doing and have the spring caged. You should be seriously injured, or killed if that spring loaded cap hits you in the head when it flies off. New assemblies do not even come apart for that reason... brake chamber assemblies are fairly inexpensive.