Author Topic: 1966 brake proportioning valve  (Read 4704 times)

EdwardGT350

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1966 brake proportioning valve
« on: November 14, 2020, 09:38:23 PM »
original brake proportioning valve is leaking.
is there a rebuilt kit available?
who is rebuilding them?
what are the correct finishes?
pix would be nice to see.
tia
ed
1966 GT350 6s1761

hertz350

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Re: 1966 brake proportioning valve
« Reply #1 on: November 14, 2020, 10:04:54 PM »
Kits are available at VA Mustang and NPD and others. The original color on many of them was grey. I have seen some painted black and some left natural. White Post Restorations rebuilds them and in the process re-sleeves them.
Own SFM6S1624, Black Hertz Automatic built 3/66 now concours trailered restored by Ken Degenstein. Former owner of 1042 a red Hertz automatic and 1643 a black automatic Hertz

Bob Gaines

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Re: 1966 brake proportioning valve
« Reply #2 on: November 14, 2020, 10:16:17 PM »
Kits are available at VA Mustang and NPD and others. The original color on many of them was grey. I have seen some painted black and some left natural. White Post Restorations rebuilds them and in the process re-sleeves them.
Some early 65 GT350's were gray . Later 65 and all of 66 were painted black to identify the special adjusted C5ZX (Shelby) proportioning valve. None were natural whether on regular Mustang or GT350.
Bob Gaines,Shelby Enthusiast, Shelby Collector , Shelby Concours judge SAAC,MCA,Mid America Shelby

hertz350

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Re: 1966 brake proportioning valve
« Reply #3 on: November 14, 2020, 10:19:11 PM »
Thanks for clearing that up. I guess the natural ones I have seen must have been rebuilt.
Own SFM6S1624, Black Hertz Automatic built 3/66 now concours trailered restored by Ken Degenstein. Former owner of 1042 a red Hertz automatic and 1643 a black automatic Hertz

greekz

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Re: 1966 brake proportioning valve
« Reply #4 on: November 15, 2020, 11:05:11 AM »
Kits are available at VA Mustang and NPD and others. The original color on many of them was grey. I have seen some painted black and some left natural. White Post Restorations rebuilds them and in the process re-sleeves them.
Some early 65 GT350's were gray . Later 65 and all of 66 were painted black to identify the special adjusted C5ZX (Shelby) proportioning valve. None were natural whether on regular Mustang or GT350.

Would that be flat or semi-gloss black?
SFM 6S1134  '67 GT-350 #2339

s2ms

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    • 6S1757 Info
« Last Edit: November 15, 2020, 01:40:25 PM by s2ms »
Dave - 6S1757

EdwardGT350

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Re: 1966 brake proportioning valve
« Reply #6 on: November 15, 2020, 01:33:23 PM »
is white post the preferred rebuilder?
any feedback on Karps brake service in upland calif?
1966 GT350 6s1761

J_Speegle

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Re: 1966 brake proportioning valve
« Reply #7 on: November 15, 2020, 02:38:03 PM »
Would that be flat or semi-gloss black?

They all appear to be semi-gloss that I've seen. Very popular and available at the time and and might have provided slightly better protection against the rust
Jeff Speegle- Mustang & Shelby detail collector, ConcoursMustang.com mentor :) and Judge

Brant

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Re: 1966 brake proportioning valve
« Reply #8 on: November 15, 2020, 04:06:40 PM »
Here is a link to a Blog post with pictures that I wrote a while back:

http://blog.virginiaclassicmustang.com/2012/10/65-66-mustang-and-shelby-disc-brake.html
-Brant

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EdwardGT350

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Re: 1966 brake proportioning valve
« Reply #9 on: November 15, 2020, 04:20:24 PM »
where do they tend to leak? mine is pretty dry.
i only notice moisture on the floorpan seam(under car) where paint started to peel. im now starting to think its weeping from a previously bad master cylinder.
1966 GT350 6s1761

greekz

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Re: 1966 brake proportioning valve
« Reply #10 on: November 15, 2020, 05:26:38 PM »
Would that be flat or semi-gloss black?

They all appear to be semi-gloss that I've seen. Very popular and available at the time and and might have provided slightly better protection against the rust

Thanks Jeff.
SFM 6S1134  '67 GT-350 #2339

J_Speegle

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Re: 1966 brake proportioning valve
« Reply #11 on: November 15, 2020, 07:07:28 PM »
where do they tend to leak? mine is pretty dry.
i only notice moisture on the floorpan seam(under car) where paint started to peel. im now starting to think its weeping from a previously bad master cylinder.

Believe they are designed so that when the seal leaks the fluid is directed through a channel and out the bottom, pass the large thick rubber band sort of seal that goes around the cylinder. I posted a engineering drawing/drawing a month or two back if you want to do a search. Might have cropped it but if you want might be worth a look
Jeff Speegle- Mustang & Shelby detail collector, ConcoursMustang.com mentor :) and Judge

ramrace

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Re: 1966 brake proportioning valve
« Reply #12 on: November 16, 2020, 12:10:03 PM »
Can anyone recommend someone who will sleeve the valves?

Bob Gaines

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Re: 1966 brake proportioning valve
« Reply #13 on: November 16, 2020, 01:10:35 PM »
Can anyone recommend someone who will sleeve the valves?
As already mention White Post is one .Apple Hydraulics is another.
Bob Gaines,Shelby Enthusiast, Shelby Collector , Shelby Concours judge SAAC,MCA,Mid America Shelby

EdwardGT350

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Re: 1966 brake proportioning valve
« Reply #14 on: November 16, 2020, 03:28:00 PM »
do the valves leak when car is just sitting or does peddle pres need to be applied?
1966 GT350 6s1761