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@patracy have you looked for any of the master cylinder adapter fittings? Only one I could find so far that fits is the 1/2-20 straight to 1/2-20 inverted flare adapter for the front port. Edelmann #265500. Having no luck finding a fitting for the 9/16-18 rear port.

Well hell Edelmann #265500 works for the 1/2-20 port but is about 3/32" too long for my mc, and bottoms out on the inside of the threaded hole. I know I need a washer here, but I'll still need to remove some material at the end of the adapter and clean up the threads after.

Edelmann #258307 does not work, the male side is beveled and won't allow the copper washer to seal. So I'm thinking a -6 AN to 1/2-20 inverted flare fitting might work (Russell #640600, steel instead of aluminum). Got one on order from amazonion but won't be here til the 18th. Summit has it but...

I found Edelmann part # 265500 to be the fitting that has 1/2-20 straight threads for the mc and 1/2-20 inverted flare on the female side. I can't seem to find one that has the same size on the inverted flare but 9/16-18 straight threads for the mc. If anyone knows of an adapter like this please...

I've discovered that the fitting on the single circuit mc that adapts the 5/16" brake line fits the air packs, so with the mc on the truck and the one I received with the sacrificial bracket I have the fittings needed for the second air pack. Working on fittings for the dual mc, I have some part...

Another where a 3D model was created. I'll definitely be referencing this model when I modify my bracket: https://www.steelsoldiers.com/threads/dual-circuit-brake-engineering-thread.73346/post-2068376

Here is a post where the author milled down an A2 bracket and bolted on a plate for the dual mc: https://www.steelsoldiers.com/threads/dual-circuit-brake-engineering-thread.73346/post-2138751

No I figured I would start a new thread detailing what I want to do. That way its clear to anyone who wants to go this direction. And hopefully have it step by step, if I can remember to take enough pictures :cool:

I am attempting to convert my single circuit brakes to dual circuit on my 71 M35A2. I have acquired a master cylinder MC39577, an extra long air pack, and a spare single circuit mc bracket to modify. Still need to find or purchase an additional air tank, and possibly a combination valve to...

Thats good and interesting info, thank you

Thats what I am trying to do. The problem is the dual port mc that is needed is too long to fit in the original location, so a custom bracket is needed. The air force and A3 deuces have a bracket that can work but those are very difficult to find. I'm going to try modifying the bracket to make...

It happens! You just need to choose the best route for you. I bought an extra rebuilt air pack a few months ago just in case the one I rebuilt didn't work, so I already had it which put me in the direction of the dual air packs. Finding that cheap mc sealed the deal for me. I also just purchased...

Subbed!

I think so and I would like that type of fail safe on my truck. Been busy with front knuckle repack and boot replacement so I will try to work on the combo valve part number search later this week.

Finally started the front axle hub teardown/boot replacement/repack on Sunday. Got the passenger side broke down, most of it cleaned and installed the boot and knuckle. Should've gone with regular boots but I used zipper style. It went on ok but the manufacturer put a rivet on the zipper almost...

I just went through the process of replacing the front steering knuckle boots. Well passenger side at least. When reinstalling the knuckle onto the axle turn the steering wheel so that the offending knuckle is turned out, or away from the truck, at the front. Assuming the knuckle is still...

So the main brake line coming off the single circuit mc is 5/16" and uses 1/2-20 fittings. Looking at the pictures below the lines off the dual mc are 1/4" and use 7/16-24 fittings. If we use mc adapters that adapt to 1/2-20 inverted flare fittings, we wouldn't have to change the adapters on the...

Post #193 where a guy modded his A2 bracket to fit the dual circuit mc: https://steelsoldiers.com/threads/dual-circuit-brake-engineering-thread.73346/page-10#post-2138751 Hoping to go this route, to keep the original look of the brake pedal. Also ordered Dorman #42041 mc cap, should be here...

Good ideas. The rubber boot under the cap still seals well. Dorman responded to me saying they don't sell the cap separately but if I return the assembly I'll lose out on the good deal. I may also rig up some hose clamps to wrap around it for the short term, bigger issue for me will be modifying...

Got mine with a broken cap. Since its a closeout and they don't have any more I would have to return it, doesn't look like there is any other option on rock auto. Hoping I can pick up a cap from the local parts store. The reservoir is metal so shouldn't be an issue running some lines to it and...