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It releases fine. The parking brakes won't engage.

Any idea if that bad diaphragm could cause the parking brake to not engage?

From the TMs I have found 4 of them. This one on the rear cross member, one on the back of the air tanks and 2 under the cab. There may be others I haven't found yet.

I just realized that the picture I tried posting of the bad two-way check valve didn't come up for some reason. Here goes again.

Is the relay valve you are referring to #24 in the first picture? They call that a plug valve in the parts TM but Bendix calls it and inversion valve. I attached a picture I found on ebay of the valve.

I took the inversion valve apart on the rear cross member and it seemed to be working. Next to it is a 2-way check valve. It have a badly kinked air line. When I took it apart it had a cracked diaphram. See attached picture. Would this cause the parking brake to not function?

Ok, what do you want for it with shipping?

Do you have the part number? Not sure I need it yet but good to have the number in case I do

Is it the one with 2 Phillips head screws? Looks like a pressure regulator?

Any idea where the relay valve is?

The pedal seems fine and the brakes appear fine. Haven't checked them individually yet. Is the treadle rebuildable?

The truck came monday and what I thought was a crack in the engine front housing ended up being some grease and dirt. Checked all of the fluids and put some fresh batteries. It started for a second and died. Tried a couple more times and same thing. Looked in the fuel tank and it was almost...

Believe want you want. I've talked directly to people at Allison who are the experts. I stand behind my information. Call and ask yourself. It's a slow painful process to get to the correct people. I'm done with this thread.

Think about this. Allison says that those fluids are now only approved for military applications. If your beloved motor oil was so good for the trans why would it not be approved for all users? Seems pretty obvious to me.

Thanks, it was a big job but satisfying. Still have a few things to complete, like hooking up the jake.

As the document I sent earlier reflects this applies to the HT and MT transmissions. The military approved are for just that the military. They required Allison to approve those fluids for logistical reasons not for longevity.

This is from Allison. https://youtu.be/lkVN6ZqloSI All I'm saying is motor oil will work for sure but it will reduce the life of the trans.

I never said anything about Dex. I was referring to fluids in the TES295 group like castrol transynd. It's not Dex 3.

The HT and MT transmissions are on highway according to Allison. Also, just because it says you can still use the military spec doesn't mean it won't shorten the life of the trans. They list those oils for specific transmissions and it doesn't include the HT or MT. I am willing to bet the...

I never uploaded any photos after getting the new motor in the HEMTT.