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Discussion Starter #1
I have a combo valve but the port on the back for the rear line does not fit, I believe the line is 1/4 but don't know about the nut size, would it be the same? The threads on the combo valve are 9/16, if I was to try and connect an adapter or something between the 2 would it leak?
 

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1974 Nova, 1977 Nova
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Hi Vnova,

You're right, the combo valve rear outlet has 9/16"-18 thread and takes a 1/4" line.

The "standard" flare nut size for 1/4" line has 7/16"-24 thread. So you need to use either a special nut with the oversized 9/16" thread or an adapter fitting.

I didn't want to cut and re-flare the rear brake line when I converted my 74 from drum to disc brakes so I used a Weatherhead #7908 adapter fitting. These adapters are made just for changing thread sizes on inverted flare connections so it seals up perfectly ... no leaks.
 

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Discussion Starter #3 (Edited)
Hi Vnova,

You're right, the combo valve rear outlet has 9/16"-18 thread and takes a 1/4" line.

The "standard" flare nut size for 1/4" line has 7/16"-24 thread. So you need to use either a special nut with the oversized 9/16" thread or an adapter fitting.

I didn't want to cut and re-flare the rear brake line when I converted my 74 from drum to disc brakes so I used a Weatherhead #7908 adapter fitting. These adapters are made just for changing thread sizes on inverted flare connections so it seals up perfectly ... no leaks.
Thanks. I don't wanna cut into the line either.

Did you buy yours online or do you know if Napa carries this fitting?
 
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