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I replaced front brake lines and had booster, MC and distribution block professionally rebuilt. I can lock up rear drums but not front disc on an original 1967 GT fast back. So, I am guessing rear proportioning valve needs rebuild/replace as well. I bought Classic Tube set from NPD for the whole car. My questions:
1- I don't see the 3 way brass connector for sale anywhere that you can see in the first 2 pictures and it seems to be part of the rear flex line. I see rear flex line for sale, but not like this.
2- I see NPD and Branda have the proportioning valve, but I can't find the little 2" or 3" hard line that connects the valve to the flex line bracket. My NPD kit didn't include it. Do I make it?
3- I checked out a friend's 1967 coupe with great brakes and the proportioning valve is not where it should be. Maybe moved? I would think it is a necessary part.
 

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The rear brake hose assembly includes the brass block to connect the left and right rear to the main brake line from the engine compartment. The in-line cylinder you picture is a 10 psi check valve that retains 10 lbs of pressure to the brake shoes so the rear brakes engage at the same time as the front discs. When I bought a new proportioning valve, I also got a new one way valve. My brake line kit from classic tube included the small 90 degree brake line connecting the check valve to the hose.
 

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1. It is part of the rear brake hose - BRAKE HOSE, REAR - #2282-2 - National Parts Depot

2. Mine came with a complete brake line kit. It should be available but I'll admit after searching the NPD web site for 10 minutes I came up empty. Are you sure that the classic tube set did not include it? Did you buy a late 67/68 set? Give NPD a call on this one.

3. Was it moved to the front near the distribution block? Regardless you should have yours rebuilt rather than trying to run without it. I have not purchased a reproduction and I always come down on the side of rebuilding rather than buying something new, but that is of course a choice. If you buy new keep the old one if you want to go back to original some day.
 

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Pictures display a stock 67 Disc Brake proportioning valve. These can be rebuilt. Muscle Car Research has the kit to rebuild them. Yes they can be a challenge, BUT can be done.
I'd put your classic back to factory, not swap out misfit parts.
 
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