The Ford Barn

CA Victoria · 10-04-2021, 01:56 PM

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?

Brian · 10-04-2021, 03:19 PM

What is the existing thread in your 70's master cylinder?

CA Victoria · 10-04-2021, 03:47 PM

I think it’s a 1/2–20 & female rev flare 1/4” line

TJ · 10-04-2021, 04:11 PM

Did you try your local parts store? Most have the correct adapters.

CA Victoria · 10-04-2021, 04:21 PM

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

Found one.
Thx....

51 MERC-CT · 10-04-2021, 04:40 PM

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Quote:

Originally Posted by CA Victoria

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.

1948F-1Pickup · 10-04-2021, 05:19 PM

Quote:

Originally Posted by CA Victoria

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/

CA Victoria · 10-05-2021, 09:12 AM

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

TJ · 10-05-2021, 09:30 AM

So where did you find them?

Mart · 10-05-2021, 10:42 AM

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.

rich b · 10-05-2021, 11:13 AM

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.

10-04-2021, 01:56 PM	#1
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	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? __________________ Tim Downtown, Ca

10-04-2021, 03:19 PM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,998	Re: Master cylinder to brake line adapter What is the existing thread in your 70's master cylinder? __________________ Unfortunately, two half wits don't make a whole wit!

10-04-2021, 03:47 PM	#3
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	Re: Master cylinder to brake line adapter I think it’s a 1/2–20 & female rev flare 1/4” line __________________ Tim Downtown, Ca

10-04-2021, 04:11 PM	#4
TJ Senior Member Join Date: May 2010 Location: Napa,California Posts: 6,566	Re: Master cylinder to brake line adapter Did you try your local parts store? Most have the correct adapters.

10-04-2021, 04:21 PM	#5
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	Re: Master cylinder to brake line adapter Yup, nada. I looking for someone with direct knowledge of the part #s. Found one. Thx.... __________________ Tim Downtown, Ca Last edited by CA Victoria; 10-04-2021 at 04:34 PM.

10-05-2021, 09:30 AM	#9
TJ Senior Member Join Date: May 2010 Location: Napa,California Posts: 6,566	Re: Master cylinder to brake line adapter So where did you find them?

10-05-2021, 11:13 AM	#11
rich b Senior Member Join Date: May 2010 Location: Minnesota Posts: 2,028	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.