what size fitting to connect 3/16 brake lines

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Rapid Robert

Rapid Robert

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the brass double female fittings. thank you for your time. RR. EDIT I purchased some 3/8-24 Ebay fittings listed for 3/16 brake lines but they were slightly to big. the double flared line would seat into the fitting but the brass male thread was slightly too big to thread in.
 
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so the male fittings on the brake lines are not right? editing my first post: the fittings on the brake lines were slightly to big to thread into the 3/8-24 brass fittings
 
Last time i had this issue i just took a line down to Napa, they had quite a stash of different connector fittings.
 
Im thinking you are connecting 2 lines with a brass fitting that has 2 inverted flare seats? They are probably metric . The standard American 3/16 hard line uses a 3/8-24 thread.
 
66Valiant528 said:
Im thinking you are connecting 2 lines with a brass fitting that has 2 inverted flare seats? They are probably metric . The standard American 3/16 hard line uses a 3/8-24 thread.
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yes. the ebay pkg was listed online as 3/8-24. dont remember if I saw 3/8-24 on the pkg but its looking like they sent me metric connectors. the 3/16 lines are just a hair to big to thread into the connectors. I will go back to NAPA tomorrow. EDIT NAPA has metric brake lines so tomorrow I will mate em up & see
 
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Brand and part numbers for 3/8-24 inverted flare brass connectors or unions 3/16 lines.
AGS BLU-3C ( See Post 13)
Edelmann 123300
Everco 300B
Weatherhead (Eaton) 302x3
Make sure label says SAE
We are assuming you have 3/16 SAE brake lines
 
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NAPAs metric brake lines should be color coded.....something other than the gold cadmium plating you typically see on sae stuff.
 
My money is on you were sold metric lines, I've had it happen because the counter jockey didn't pay attention and I took his word for it being correct. These days I take a sample fitting with me so "I" can make sure I get the correct line.
 
Ive seen 3/16 lines with all kinds of OD fittings, the master cylinder is a common place for mismatched thread size. I've seen stacks of adapters from the dorman or weatherhead cabinet used to adapt the line that comes on a section of premade line to those components. It looks rugged and every joint is a potential leak.
I cut, bend and flare my own brake lines and whenever possible I reuse the original fittings on the new line.
A company called SUR&R is the best I know at being able to get new replacement fittings from that are 3/16 ID and whatever size thread needed to not have to do the stack thing..
Like I know a lot of 70s/80sfords used 3/16 line but 7/16-20 (standard 7/16 fine thread) thread size at the master. Most wheel cylinders and the hard line end at the rubber flex lines still take the standard fitting as comes on the premade, pre flared sections that the parts stores sell.
But I've seen all kinds of hacked, bent, wrapped around kinds of crap trying to "use up length" on those premade ones. I buy line in 25 foot rolls and cut/bend/ flare as needed. Always have.
 
today I bought some AGS BLU-3B unions. says 3/16 tube size. thread size 3/8-24 inverted. I will find out tomorrow where I am at with this.
 
Turns out that AGS part numbers are determined by how they are packaged.
Examples of 3/16 - 3/8 x 24 brake line unions
BLU-3C packaged 1 per card
BLU-3 packaged 10 per bag
BLU-3B packaged 1 per bag
BLUX-3 packaged 100 per box

So the BLU-3B however its packaged is one of the numbers correct for 3/16 brake line.
 
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thanks townsend thats good to hear. volaredon with the price of those prefabbed lines yes I'd been better off getting a roll of tubing & double flaring them myself! especially since that would give me the exact lengths I need
 
Even if I use a length of prefab I still cut and flare as needed
 
well it turns out that the chinese 3/16 prefabbed lines/fittings would not fit 3/16 connectors. I refunded em at NAPA & bought some 3/16 NAPA lines/fittings on the other side of the NAPA rack & they screwed in perfect!
 
brake line tube nuts come in 2 types for each size
one type has no lead in to the thread
the other type has a lead in before the thread, a smooth area from the end before you get to the thread.

this is probably an SAE/Euro/Japanese standards thing....

chrysler in just about all cases used the type with no lead in, this is due to the chosen style of pipe flare and what the tube nut was screwing into.
you can get both to screw into most chrysler parts but the lead in type are then only held in by 2 threads....which is no good, i.e you need the correct NO LEAD pipe nuts.
the only odd fitting is one of the master cylinder fittings and its bigger than all the rest I guess to stop you plumbing in the rear circuit into the wrong end of the MC. it bolts into a deep recess in the master so i guess either type with the right size thread would probably work here.

ebay and walmart style kits of pipe and a bag of tube nuts and fittings invariably are the lead in type that you don't want.


a brake place or well stocked parts store should have both types

the nut type and what you screw it into are a pair and its related to the style of flare to be used

|NO LEAD nuts shown here
45 Flare Sae Inverted Flare Tube Nut Fitting for 3/16 Brake Line Tubing 16Pc Set | eBay UK?



nuts with the lead in that you don't want here
3/16" 12Pcs Brake Line Repair Female Union Inverted Flare Tube Nuts Car Bike UK | eBay UK

Dave
 
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