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1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1967 Mustang => Topic started by: kkupec02 on July 03, 2020, 11:38:39 PM

Title: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: kkupec02 on July 03, 2020, 11:38:39 PM
I replaced front brake lines and had booster, MC and distribution block professionally rebuilt for my 1967 GT500. I can lock up rear drums but not front discs. 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 working brakes and the proportioning valve is not where it should be. Maybe moved? I would think it is a necessary part.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: RoyceP on July 04, 2020, 09:31:58 AM
Your photos show the proportioning valve exactly where it should be on all 1967 Mustang / Cougars with factory front disc brake / rear drum drum brake combination. Like you say it probably needs to be rebuilt. New lines are available from Fine Lines and other typical sources. 


I replaced front brake lines and had booster, MC and distribution block professionally rebuilt for my 1967 GT500. I can lock up rear drums but not front discs. 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 working brakes and the proportioning valve is not where it should be. Maybe moved? I would think it is a necessary part.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: Bossbill on July 04, 2020, 01:42:21 PM
Some brake line sets include the small brake line.

The junction is part of the rear brake line hose and is specific to dual exhaust cars if I remember right.

Here are a few pics.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: 1967FEGT on July 05, 2020, 01:10:47 PM
67-70 would be the same except staggered shock vehicles. 428 CJ/ Boss 302/ Boss 429.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: Bossbill on July 05, 2020, 04:51:32 PM
I corrected my post above, and the application years are 67-69.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: 1967FEGT on July 05, 2020, 05:20:32 PM
I corrected my post above, and the application years are 67-69.

Sorry, I missed it. I thought you were correct too. I went to look it up to verify what I had recalled.  I think 65-6 cars even had something different for dual exhaust.  How is your Shelby coming along, Bill?
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Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: Bob Gaines on July 05, 2020, 06:01:03 PM
67-70 would be the same except staggered shock vehicles. 428 CJ/ Boss 302/ Boss 429.
Easy mistake to make but the 428CJ auto which doesn't have staggered shocks used the same rear brake hose bracket as the staggered shock cars.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: 1967FEGT on July 05, 2020, 06:16:38 PM
Good to know Bob. I didn't see any reproductions for staggered shock cars. Not to say there isn't. I didn't see anything in three major supplier's catalogs.
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: Daisy on July 06, 2020, 02:42:12 PM
I used WCCC (West Coast Classic Cougar) rebuild kit and watched the video on their site. Worked great! [big thumbs up]
Title: Re: 1967 Rear Brake Line/Proportioning Valve Questions
Post by: 1967FEGT on July 06, 2020, 03:24:10 PM
I used the same kit from NPD. The residual valve can very easily damaged if the brake fluid calcifies. It doesn't come with the check ball. If you destroy it during disassemble the unit is trash. The grease gun trick works wonders in a pinch.