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Welcome back Rustystud! Looking forward to your advice again and some updates on your truck projects.

Not sure, but I would guess it is in the $2-4k range for all the hydromax parts. Also needed would be a hydraulic pump off of the old 5ton lds engines.

If starting fresh and i had the money, id probably go the Hydro-Max route like Jesse did in the below links. This gets you simplicity from no airpacks, gives dual circuit, hydraulic pump off the engine, differential pressure warning switch, residual pressure valves, remote reservoir, and a 24v...

Honestly I’m not sure if the priority valve will solve your current issue, in fact I suspect it won’t, but figured I’d mention it anyway. I’d recommend pm’ing someone like gringeltaube or rustystud.

You probably know this from the TM diagrams, but the dual circuit trucks have a priority valve on the drivers side frame rail (Bendix 278614 DC4). Both airpacks have an air line going to the priority valve and from it a single airline goes to the gladhand. Check out these, maybe it will help...

Download this TM for the m35a3: https://www.steelsoldiers.com/upload/M35/TM9-2320-386-24P.pdf I think most of what you need would be between pages 236-256, although it could still be unclear. If so let me know and I'll try to get some pictures under my truck for you. I cant remember off hand...

Yeah, hopefully it is just some air lines mixed up, it does matter. Spend some time looking at the tms and pics to make sure you have it right.

Was the air pack new, nos, rebuilt, used?

I’m not aware of any issues either, it sounds ideal to me. Just make sure to route the larger of the fluid ports to the front axle.

TNJ Murray has some NOS A3 tanks with the dual chamber for $155. http://www.tnjmurray.com/militaryvehicles/index.cfm?shop/product/catid/47/id/31B908B7-5056-A847-7AD2CCB29F1ECF14

it shouldn’t be a flat cup. Check out the last photo in post 11 here (it shows the face of both wheel cylinders where the link pins mate) https://www.steelsoldiers.com/showthread.php?117663-%D8-1-%BD-quot-Wheel-Cylinders&p=1538032&viewfull=1#post1538032

Yes, they will work fine but the link pins need modification, see these threads: https://www.steelsoldiers.com/showthread.php?117663-Wheel-Cylinders&p=1538032&viewfull=1#post1538032 https://www.steelsoldiers.com/showthread.php?130591-Air-pack-locked-up&p=1625924&viewfull=1#post1625924

Remember the dual circuit systems have a special 2 chamber tank, or you can add a 3rd tank like you mentioned. If you get the outboard side A3 style tank it may be a quicker nstall though. I think you will be fine with the reservoir located anywhere at or above the original position. The...

Yes, you can use air-brake hose to connect the remote reservoir to the master cylinder. I'm not sure how the seats are installed, I'll leave that to RustyStud to answer. I also dont know where to find any good fitting differential valves. In my case I decided to use a 1.75" bore 60/40...

I cant say for sure, but i believe either will work. Since its a dual circuit system, its essentially 2 seperate brake systems that share the same fluid reservoir. If it was me, I'd be okay using one of each style airpac if thats what i had on hand.

The 87-88 dual circuit A2 trucks had master cylinders with the larger port sizes which meant they had internal residual pressure valves. It the port sizes are the 9/16 or 1/2" then the master cylinder doesnt have RPVs. Also the 87-88 trucks had 1-3/8" wheel cylinders all the way around and use a...

Check post 145 for pictures and more details: https://www.steelsoldiers.com/showthread.php?73346-Dual-Circuit-Brake-Engineering-Thread&p=2068376&viewfull=1#post2068376

I agree that a weldment is likely the best way to make this in the safest fashion for the lowest cost and in the low quantities that realistically would be needed. A 3d printed jig is a great idea and having the printed bracket will let you verify that everything important lines up right.

Also its the same boot used on the A3 trucks. I've bought some off ebay a few times. Here are some pictures...

CAD File for Master Cylinder Bracket Well Clinto was able to obtain a new Dual Circuit Master Cylinder Bracket. We modeled it up in 3D CAD....and then ran out of time to put much additional effort into the project for the time being. We understand that this is a complex shape and not something...