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Old 05-15-2008, 03:38 PM
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Brake line fittings

I have a generic, GM 1970 Camaro manual master cylinder(disc/drum) with a "gold" colored GM proportion/combo valve. I'm making new lines for the car and had a couple of questions before I buy fittings.

1)Does anyone know what size Inverted flare fitting exits the proportioning valve for the single rear outlet? Is it a 9/16" x 18 or a 1/2" x 20 ??

2)Also, what size Inverted flare fitting exits the proportioning valve for the two front brake lines??? Are they both 1/2" x 20 or 3/8" x 24 ????

thanks
Tubbedz

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Old 05-15-2008, 04:28 PM
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I dont know were you got your measurements at but most brake lines OUT of the proportioning valve are 3/16 45* flare.

take the cyl and valve to your local parts store and ask for some of the short copper/aluminum/cheapo lines that have the tube nuts already on them. Thats about the best thing for mocking up the lines.

Then you can take them loose buy your GOOD steel lines and then use the tube nuts off the chepos.
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Old 05-15-2008, 05:12 PM
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GM used non-standard flare nuts on most of it's brake lines (different thread diameter and pitch than normal for a given tube size). This was done so that each line had a different size nut to prevent mis-connections on the assembly line. Many of the brake line specialty houses (Inline Tube, Right Stuff, etc) sell these flare nuts, but I usually reuse the old ones.
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Old 05-15-2008, 06:36 PM
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Quote:
Originally Posted by Holder350
I dont know were you got your measurements at but most brake lines OUT of the proportioning valve are 3/16 45* flare.

take the cyl and valve to your local parts store and ask for some of the short copper/aluminum/cheapo lines that have the tube nuts already on them. Thats about the best thing for mocking up the lines.

Then you can take them loose buy your GOOD steel lines and then use the tube nuts off the chepos.
Holder 350
Yes, most cars have a 3/16" diameter line with a 45' flare. My car has a single out line from the proportioning valve to the rear and the diameter of that line is not 3/16". It is about 3/8" and looks like a large 9/16" x 18 IFF fitting. The front exit out of the proportion valve looks to have two 3/16" diameter lines with 1/2" x 20 IFF fittings. All these lines are standard 45' degrees, unless I decide on AN fittings which are 37' degrees.

I'm just unsure of the fitting's sizes and don't want to take several trips to the parts store while I'm working on the car. I would rather have the parts at hand so I can finish the job quickly. Somedays it seems like I spend more time going back and forth to the parts store than actually working on the car.

thanks
tubbedz
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Old 05-15-2008, 06:44 PM
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Quote:
Originally Posted by joe_padavano
GM used non-standard flare nuts on most of it's brake lines (different thread diameter and pitch than normal for a given tube size). This was done so that each line had a different size nut to prevent mis-connections on the assembly line. Many of the brake line specialty houses (Inline Tube, Right Stuff, etc) sell these flare nuts, but I usually reuse the old ones.
Thanks Joe!!
I think i will have to take the pro-valve off and measure the fittings. A friend of mines has the same master and pro-valve combo and he has totally different fittings on his car.

I guess I will have to make several trips to the parts store and will probably have the car sittting longer than I would like. I thought I could do it the easy way and have all the fittings before I do the tear down. I just hate running back and forth to the parts store when I'm in the middle of something. Some days I spend more time hunting down a part than actually working on the car.

tubbedz
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Old 05-15-2008, 07:35 PM
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The inverted flare fitting that goes to the rear brakes on GM combination valve is 9/16- 20 for 1/4 inch tube. I'm also running brake lines and just measured off a stock combination valve. Dave
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Old 05-15-2008, 08:11 PM
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like I said tho.....you best bet is to take the master cyl and porpotioning valve off and take them with you.....then get your adapters (you WILL need them to get back down to a 1/4 or 3/16 line)

If you take them with you there is no running back and forth and with gas at $4 a gal thats not something you want to be doing.
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Old 05-15-2008, 08:58 PM
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I disagree, Holder 350, no adapter is required to make this work. It's a 9/16-20 thread in the combination valve which is designed to work with 1/4'' tubing. No adapter needed. Dave
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Old 05-15-2008, 09:45 PM
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correct 1/4 line but unless you find someone who sells that tube nut or have an old one you have to have a an adapter to do that.

I have done ot before on a mavrick we were setting up for drag raceing....got a headache then too.....and IIRC we had to order some of the fittings
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Old 05-15-2008, 09:53 PM
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When you are unsure of the thread pitch and diameter, you can use a standard SAE bolt (or nut for checking male threads),of appropriate size to check the threads..

The only weird one is the 7/16-24 thread found on some components.

Alot of places sell the nuts, I buy mine from my local napa store, also, Speedway sells them.

Later, mikey
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Old 05-15-2008, 10:39 PM
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yeah Mike....while I was working at NAPA it seemed that they had the best selection of fittings.

and what ever you need....most of the DCs had a full line of weather head fittings. So anything we needed was overnight.
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Old 05-15-2008, 10:41 PM
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As we look at the combination valve there are five lines, two in, three out.The 1/4'' line going to the rear brakes is 9/16-20; the two 3/16'' lines going to each side of the front brakes are 3/8-24; the 1/4'' line coming in from the master cylinder is 7/16-24; the 3/16 line from the MC is 1/2-20. I doubt very seriously that you will find any kind of adapter that will take you from inverted flare to inverted flare. I also believe that this answers the man's question. Holder 350, what kind of fittings are you speaking of? Dave 39
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Old 05-15-2008, 11:21 PM
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At NAPA we had some 45* male to female adapters (inverted flare to inverted flare) They were weatherhead brand.

course we also had a Tube and Hose machine....and we could order tube nuts with almost any thread size and specify the tube size.

Edit: Just remembered that they were called a Dual master cylinder adapter.

Heres a link to a fitting list Here

Last edited by Holder350; 05-15-2008 at 11:29 PM.
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Old 05-15-2008, 11:45 PM
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Quote:
Originally Posted by Dave 39
As we look at the combination valve there are five lines, two in, three out.The 1/4'' line going to the rear brakes is 9/16-20; the two 3/16'' lines going to each side of the front brakes are 3/8-24; the 1/4'' line coming in from the master cylinder is 7/16-24; the 3/16 line from the MC is 1/2-20. I doubt very seriously that you will find any kind of adapter that will take you from inverted flare to inverted flare. I also believe that this answers the man's question. Holder 350, what kind of fittings are you speaking of? Dave 39
WHAMMO!!!!!!!!
Dave 39, you hit it on the nose!!!! This is what I needed to create my one stop shopping list!!! Thank God, I will only need to visit the parts store once and can work on the car straight through!!!

Dave 39.....you're the man!!!!

tubbedz
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Old 05-16-2008, 12:04 AM
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That's pretty good info there, Holder 350; and to tubbedz, when I work on my car ''one stop shopping'' has never worked out real well for me. Oh well, good luck. Dave 39
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