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Old 10-04-2021, 01:56 PM   #1
CA Victoria
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Default Master cylinder to brake line adapter

I have a Early 70s master cylinder that I need adapters for 1/4 inch inverted flare brake lines.
Anyone have the part numbers handy that i can go off of?
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Old 10-04-2021, 03:19 PM   #2
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Default Re: Master cylinder to brake line adapter

What is the existing thread in your 70's master cylinder?
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Old 10-04-2021, 03:47 PM   #3
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Default Re: Master cylinder to brake line adapter

I think it’s a 1/2–20 & female rev flare 1/4” line
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Old 10-04-2021, 04:11 PM   #4
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Default Re: Master cylinder to brake line adapter

Did you try your local parts store? Most have the correct adapters.
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Old 10-04-2021, 04:21 PM   #5
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Default Re: Master cylinder to brake line adapter

Yup, nada.
I looking for someone with direct knowledge of the part #s.


Found one.
Thx....
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Last edited by CA Victoria; 10-04-2021 at 04:34 PM.
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Old 10-04-2021, 04:40 PM   #6
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Default Re: Master cylinder to brake line adapter

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Quote:
Originally Posted by CA Victoria View Post
Yup, nada.
I looking for someone with direct knowledge of the part #s.
Most likely a '70's dual master cylinder will have two different dia's to differentiate where the front and rear lines go.
Check with a dealer for which ever brand the master is used on.
Doubt if you will get a part # here.
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Old 10-04-2021, 05:19 PM   #7
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Default Re: Master cylinder to brake line adapter

Quote:
Originally Posted by CA Victoria View Post
I have a Early 70s master cylinder that I need adapters for 1/4 inch inverted flare brake lines.
Anyone have the part numbers handy that i can go off of?
I'm guessing you need 1/2-20 tube nuts for 1/4" SAE flared steel line?

https://agscompany.com/product/steel...2-20-inverted/
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Old 10-05-2021, 09:12 AM   #8
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Default Re: Master cylinder to brake line adapter

In case someone else is looking, the correct call out is:
1/2-20 x3/8-24 inverted flare (1/4 tube) brake line adapter.
There are two different sizes the larger adapter is 9/16-18 x 3/8-24 inverted flare
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Old 10-05-2021, 09:30 AM   #9
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Default Re: Master cylinder to brake line adapter

So where did you find them?
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Old 10-05-2021, 10:42 AM   #10
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Default Re: Master cylinder to brake line adapter

You stated in your first post you want 1/4" pipes. The fittings you have listed seem to be quoting a 3/8-24 thread which is for a 3/16" pipe.
Dual masters I have had have had a 1/12" and a 9/16" thread fitting.

Look up the fittings below. I found them at Rockauto.
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Old 10-05-2021, 11:13 AM   #11
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Default Re: Master cylinder to brake line adapter

Something to watch out for when using those adapters; couple times I found that the adapter contacted the body of the master cylinder instead of seating on the brass insert. Faced off the body a bit so it seated.

I usually use the "oversize" tube nuts instead of the adapters when I can.
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