So I'm installing a manual mc. Easy job right? Hell no! I installed an adjustable proportioning valve. Neato. Bent the tiny little line, that was a booger. Started working on the front reservoir line, and that is a weird fitting size. The fittings that come with the kit are coarser thread. Any ideas what fitting this is? Anyway I'm hoping one of you gurus can help!
What fitting is this?
- Thread starter Mean416
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Hard to tell by the picture. I have a bunch of adapter fittings. To bad your not closer.
You don't say what exactly you are working on and if it is a conversion.
Usually it is wiser to verify parts before you install them. Just sayin...
Usually it is wiser to verify parts before you install them. Just sayin...
67Dart273
Well-Known Member
Master cylinders over the years have always been a problem, using (sometimes) non-standard fittings. Even if they are a standard inverted flare diameter/ threads per inch, they are almost always a thread meant for a larger line size. "They" did that to prevent mixup in the front / rear lines
Over the years you can buy adapters, especially back in the day when people used brake pressure activated trailer controllers.
You have a thread gauge? I'd start there
Over the years you can buy adapters, especially back in the day when people used brake pressure activated trailer controllers.
You have a thread gauge? I'd start there
It's a conversion, going back to manual. 72 dart. I got a 4 hole 15/16 mc. Don't really know other details,pre-fitting parts isn't always possible, just depends on what you have in hand.
It's a 1/2" inverted flare fitting but the typical 1/2-20 thread is too coarse.
It's a 1/2" inverted flare fitting but the typical 1/2-20 thread is too coarse.
The normal practice is to bench bleed the master before installing it. Conversions are never true bolt ons.
Possibly metric thread?
It doesn't look like the housing has a inverted flare machined in so you have a tapered pipe thread. You will need a TPT to inverted flare adapter. They are usually brass and you should be able to get one at the parts store or hardware store.
Wow, first time I've ever heard of that in a brake system. You learn something new every day.
As I understand this was factory
Yes. This is what I need. Might have to start scouring eBay for used mc.
It's not npt. I pulled out the residual valve on that port this morning, there's a brass inverted flare seat in there.
Really appreciate the help y'all. I gotta find one of those adapters now.
I'll make up some little tubes to "bench bleed" it in the car. They'll attach on the output of the proportioning valve. Or maybe I'll just do it without bench bleeding. We'll see.
In the pictures you can see one of the fittings that came in a fitting assortment I purchased. Alongside one of the plugs that came with the master cylinder. The plug has a slightly finer thread. 0.54 diamater. I'm trying to work out the thread pitch.
Certainly straight flare threads and not NPT. Are you 100% that's 1/2" pipe? Usually the larger size is 9/16 "whatever" the thread count is.
Well geez, if it has a brass flare inside you should be able to screw a double flared line into it as long as the flare nut is the right size. We can't see what you have unless you show us.
We talking fittings for the mc or valve? Hard ware stores have ferrules in all sizes. If it npt, 1/4-14 for the valve and either 3/8 or 1/2 inch npt for the mc. Too bad you didn’t try the fittings before installation, now you will have to take it all apart to carry the mc and valve into the hardware store.
I don't think brake systems are suppose to use compression fittings.
Correct. It's definitely a regular inverted flare in there.
The one on the right looks like the one that is used on my master cylinder with 3/16 line. I suspect the one on the left is for larger line?
A new master is under $50. ...
This is a new one. It didn't come with that fitting. But I'm with you. Worst case I can just get an aftermarket one.
I'm not sure what you're asking? As in the car itself? It's a 72 dart swinger.
The MC is a 15/16" 4 hole deal originally intended for front disc, rear drum applications. I'm using it to switch to manual brakes because the engine doesn't pull enough vacuum for power brakes. My car has a disc conversion on the front and rear, and I removed the residual valve from the rear circuit on the new MC. I'm not sure what all cars had this style of MC but I'm guessing it was a lot of them. Besides that info I don't know what else to supply is there anything else I'm missing?
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