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
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.
Quote from: hertz350 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.
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.
Thanks for clearing that up. I guess the natural ones I have seen must have been rebuilt.
Quote from: Bob Gaines on November 14, 2020, 10:16:17 PM
Quote from: hertz350 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.
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?
A few previous prop valve discussions....
https://www.saacforum.com/index.php?topic=10452.0 (https://www.saacforum.com/index.php?topic=10452.0)
http://www.saacforum.com/index.php?topic=8471.0 (http://www.saacforum.com/index.php?topic=8471.0)
http://www.saacforum.com/index.php?topic=8525.0 (http://www.saacforum.com/index.php?topic=8525.0)
https://www.saacforum.com/index.php?topic=10717.0 (https://www.saacforum.com/index.php?topic=10717.0)
is white post the preferred rebuilder?
any feedback on Karps brake service in upland calif?
Quote from: greekz on November 15, 2020, 11:05:11 AM
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
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
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.
Quote from: J_Speegle on November 15, 2020, 02:38:03 PM
Quote from: greekz on November 15, 2020, 11:05:11 AM
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.
Quote from: EdwardGT350 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.
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
Can anyone recommend someone who will sleeve the valves?
Quote from: ramrace on November 16, 2020, 12:10:03 PM
Can anyone recommend someone who will sleeve the valves?
As already mention White Post is one .Apple Hydraulics is another.
do the valves leak when car is just sitting or does peddle pres need to be applied?
Quote from: EdwardGT350 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?
Believe it depends on how bad the seal is and if there is a leak above the valve allowing air to enter the system
I have no affiliation with White Post, but I have had three sleeved and rebuilt by them. I have no issues with the two that have been installed in my cars. The other sitting in my tool box. Excellent job and would recommend their work.
Quote from: EdwardGT350 on November 15, 2020, 01:33:23 PM
is white post the preferred rebuilder?
any feedback on Karps brake service in upland calif?
Jeff does great work over there at Karps.He did my Hertz and is doing my other Shelby.
My father in law (rip) did mine 30+ years ago with a brass sleeve and it's still perfect.
Quote from: EdwardGT350 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?
Mine started leaking while stored last winter. Not sure if cold weather contributed to it or not but it had been rebuilt by Whitepost and in use for 4 years with no leaks.
More details in https://www.saacforum.com/index.php?topic=10452.0
Also after re-reading that thread, I realized some of the o-ring testing I did with DOT 3 and DOT 5 showed only Nitrile o-rings would swell in DOT-3 which now that I think about it, would help seal the end cap and may be why Whitepost and others don't guarantee their valves with DOT 5 fluid.
I have noticed an interesting phenomenon with these, particularly on ebay. Apparently, if you take an old crusty, leaking one, put it in a blue and white box and leave it on a shelf for a while, it becomes an NOS one. Sort of an automotive transubstantiation . . .
john
Marty????????