Geoff Weeks

I miss the "good old days" when every car had a bumper jack, and the metal "foot" of the jack was just the right shape for breaking the bead on any tire! Line it up under the front bumper, install the jack and a few quick pumps (or ratchets) and the bead was off, flip the rim over and do the other side.

Air drier still need a signal from the gov to the air drier. That means two lines, one for the air pressure from the wet tank, and the 2nd for a purge signal to the air drier. That line comes off the middle port. Same port that goes to the unloader port on the compressor. He may have one hidden behind the intake piping, I can't see.

What I don't see (may be there, I don't see in the pictures) is a signal line to an air drier for purge. Does this truck have an air drier? Moisture and oil/gunk from the wet tank can get back to the governor if the tanks aren't drained EVERY day when in use, without an air drier. I, for one, can never be bothered to drain tanks every day. I had air driers on my stuff and never had a problem until the drier had some sort of problem. If you don't have a drier, they are not hard to install to limit future problems. You may get it to work by cleaning as Brocky recommends, but if you don't address the source of the problem, it may stick the next time you need the truck.

Air governors from top to bottom. Old Bendix, Midland front, Midland rear, Bendix D-2

D-2 Pretty much an air gov is an air gov, you can put any kind on there. Bendix, Midland, it doesn't matter.

Next time it happens, disconnect the ABS actuator electrically while it is leaking, if the leaking stops, the problem is in the electrical portion of the ABS, if not, it is in the pneumatic portion and is likely crud in the air system sticking the valve open.

Replace the gov, Unloader only gets air from the gov. Had it happen many times with stuff that sits. If compressor valves are stuck in the unloaded position it will not build air at all.

Does the truck have traction control?

To be clear, you lay the gasket over the item, feel for the bolt hole, put a larger ball bearing at the hole, and strike with a hammer. Then put a bolt shank or rod through the new hole, and move on to another. I like to do the holes 180 apart 1st to more accurately punch the rest of the holes. Even used on holes you already made, it cleans up the hole in the gasket paper.

Put a ball bearing over the hole and strike with a hammer.

I think you had two distinct problems, and the 2nd didn't come to your attention until you addressed the 1st. The MV-3 should not have fallen apart when removed, so there was a definite problem with it. The spring brakes shouldn't have taken close to a minute to apply with the loss of pressure in the red line of the trailer, problem #2. Good that you addressed both. The 2nd would fail a level 1 inspection if the inspector was any good. It would have resulted in an OOS for the trailer. The 1st likely would result in a OOS for the tractor, although it was only an issue when hooked to a trailer so should have allowed you to bobtail away for a repair. P.S. we ALWAYS like to hear results, it helps in future problem solving.

I'm reaching a point in my life, that when Rory dies, I'm not sure I have another 15-16 years I can provide to a young dog. The only thing worse than my dog's passing would be for me to pass before him. I can't imagine how to make sure he would be cared for. My 2 dogs were over 1 year old when I got them. I think this time I would look for an older dog that needs a good home, and can be cared for in its older years. Only "puppy" I had was when I was growing up. While it is nice to be there from the beginning, there is plenty of love coming into their lives later also.

If it is anything like the screens in Cummins engines, they are there to be easily and cheaply replaced, to protect parts downstream that are hard and expensive to replace if plugged with debris. Remove or defeat at your own risk. Is it in the EGR cooler line?

So sorry to hear that. It is tough. I can't go through it with dry eyes. Buried one and the dog I have now isn't long for this world. The love they give their whole life doesn't make it easier but does blunt the pain long term, I have the good memories of all animals that have passed through my life..

I don't know why, but the Rotochamber was like 10X the price of a clamp chamber, there isn't a lot more to them then the clamp type. They are smaller in overall diameter for the same area (type number) then the clamp type. There there were the true Maxi brake, where you couldn't cage the spring and there was no way to manually release.

I am not familiar with those, and they don't have the "step" that the rotochamber does. I wasn't doubting you, I just saw what he pictured as a rotochamber. I don't think I've ever come across the Wagner, in my time, but don't claim to have seen it all.

I don't know, the O/P listed a part number which is for a Bendix rotochamber. That Bendix looks identical to the chamber in the picture. There were piston chambers, most I've seen are for spring brakes. Piston compresses the spring brake, diaphragm for service. https://www.amazon.com/Bendix-101260N-Rotochamber/dp/B0BVYDKZ4B

What did you see when you ran the test? With or without the hole in the web?

It is not a piston that wears a ridge, If the can is solid and the screws come out, your good to go. There is no wearing contact between the piston and the outside, the bladder is a "rolling lobe" like an air bag on air ride.

The "bladder" is about $200 +/- depending on where you get. Toss up between two Type 24's or one "badder" for the can. I would keep the rotochamber, but that is me.

The one he has come apart with a ring a screws around the outside to take apart.

There is a return spring, just like on a clamp type chamber, but it is weak just to return the piston, not like a spring brake, which provides the braking force.

Take the red and blue lines off the spring brake valve. Have someone in the cab press in the red button, you should get a large volume of air out the red line, basically a direct line to the red tractor line, so lots of air. red button will not lock in because it detects a large leak. Re connect the red line and have him charge the trailer. No air should come out the blue line or the fitting on the spring brake valve it was attached too. have the assistant pull the Johnson bar, you should get lots of air out the blue line. If it passes that test, re-connect the blue line (red should already be on) Pull out the red knob. remove any one of the black lines and its fitting from the spring brake valve. Install a 0-150 psi gauge in the port and have the assistant push in the red knob, you should see the pressure on the gauge rapidly rise to system pressure. Then have him pull the red knob out, the pressure should fall to 0 almost at once. Do not have your face under the spring brake valve when preforming these tests, you could get air and debris blasted into you. Test results poor low flow on the red = clogged line Poor-low flow on the blue= clogged line delivery port pressure checks doesn't rise to system pressure or leaks constantly =failure of valve Doesn't exhaust pressure immediately when red knob is pulled, but maintains pressure or pressure falls slowly = failed valve

1st picture is the ABS 2nd picture might be it, but is not a SR-5 so not subject to recall. You don't even know if the valve is at fault, could be crap in the lines. Looks like a "Sealco" spring brake valve: https://sealcocvp.com/product/110800/ Again, I advise against replacing stuff "willy nilly" esp when we are talking about stuff as important as brakes. Note: there are two version of this basic valve, one prioritizes the res the other the spring brakes, make sure you get the right one if you do replace it. One will have a drilled hole on a web for ID purposes.

On an air tank most often, but don't go half assed running to replace it. I don't know if your trailer even has one, or that it is the problem. I needs proper diagnosing of what is the problem. I just mentioned the SR-4 because I had one that the only symptom was the spring brakes didn't apply (until all the air in the trailer was lost). In looking at spring brake valves, I came across the SR-5 re call.