Looking for quality proportioning valve

[69hurstolds]

I would love to rebuild the factory unit, where do you get the rebuild kit?

1979 Kelsey-Hayes Cast Iron Combination Valve Autopsy | Muscle Car Research LLC

www.musclecarresearch.com

Check out this website. MOST of the rebuild o-rings and parts and junk are available. There may be one or two items not available. Pain though that they piecemeal the kit. Instead of one overall kit, you have to buy a bunch of little sub kits. WTF?

Oh well, they're fairly cheap, and I just noted where everything went and slipped it all back together after the extensive cleaning.

 

[Neill]

As long as I'm replacing almost every part in my brake system I should probably replace the 36 year old proportioning valve ( that has sat parked for 11 yrs) I have heard a lot of complaints about lousy imported aftermarket replacements. I would like to avoid those if at all possible. I want to keep it in the stock location for sure. Wilwood has an adjustable one that looks like it might fit the stock location but I could be wrong. Also this is for a disc/ drum application. Thanks in advance

OEM cats.com will sell you a new correct new old stock valve for $72.81. GM part number 25509419. The last proportioning valves for our cars were brass from GM, after they quit using the cast iron Kelsey Haynes, which had problematic internal rusting of the internals. On a side note, there are still caches of O.E.M. parts for our cars in the Middle East , such as these proportioning valves, that have not been available for decades anywhere in the U.S. I bought a late run brass valve that uses this part number for my '84 Camino off e bay a year ago shipped from Jordan for 99.00. It came in the sealed GM package, and was like the iron one, only brass. If you cannot find a part, it's a good idea to go on e bay and type in the GM part number. You might be surprised what comes up !

 

[Longroof79]

OEM cats.com will sell you a new correct new old stock valve for $72.81. GM part number 25509419. The last proportioning valves for our cars were brass from GM, after they quit using the cast iron Kelsey Haynes, which had problematic internal rusting of the internals. On a side note, there are still caches of O.E.M. parts for our cars in the Middle East , such as these proportioning valves, that have not been available for decades anywhere in the U.S. I bought a late run brass valve that uses this part number for my '84 Camino off e bay a year ago shipped from Jordan for 99.00. It came in the sealed GM package, and was like the iron one, only brass. If you cannot find a part, it's a good idea to go on e bay and type in the GM part number. You might be surprised what comes up !

Looking on Ebay, I noticed that a few vendors indicate the GM part # and in small print disclose that it's a copy of the GM combo valve. How do these compare to the "actual" GM part?

 

[69hurstolds]

It's hard to say how they compare to the GM stuff. GM never built a thing, they had some vendor make it. So it's possible Bendix or someone else made the valves, which made valves for everyone else as well. Meaning same part. But again, maybe not. It's hard to tell when there's no tell-tale markings. I do know that it wasn't long after G-body production the valves went to brass.

OEM cats doesn't sell squat. They list where you can find the items mostly, but their data isn't always up to speed. That combo valve is no longer available at GM parts giant as their website no longer shows it as an available part.

SO........it's gone. Secondary markets if you can find them. Problem is trying to actually find a genuine GM one.

 

[64nailhead]

I'm with '81 Cutlass - chased this down to get a valve. Did end up with an Inline Tube valve ordered directly from them. But at the end of the swap from stock fronts to C6 fronts with stock rear drum, and then C6 in front and GM metric disc in rear, the proportioning valve had little to no affect on braking, effort or feel. Getting a properly sized master cylinder was the solution for me.

I know the OP wants to have new, but if it ain't broke, then don't fix it regarding a prop valve. If yours work properly, then flush the entire system with a couple of quarts of fluid and forget about it. The darn thing is out sight and out of mind, and they don't catastrophically fail like an old brake hose, line or caliper seal can - meaning lose your brakes.

 

[69hurstolds]

The proportioning valve is only in the rear section anyway, and more of a regulating valve when you stand on the brakes. So in normal braking, the combination valve doesn't really do anything much. Should last for a good long time, fingers crossed.

But generally, nothing moves in there for YEARS if you're braking normally and things aren't leaking. The corrosion and gunk build up settles in the valve and eventually you MAY have issues with it if original because of the cast iron and other metal parts inside corroding. Seals leaking, etc. Then you have to replace it or rebuild it. I do agree, 99% of all brake issues when doing a four disc conversion usually ends up with the master cylinder not being upgraded as well.

 

[Neill]

The proportioning valve is only in the rear section anyway, and more of a regulating valve when you stand on the brakes. So in normal braking, the combination valve doesn't really do anything much. Should last for a good long time, fingers crossed.

But generally, nothing moves in there for YEARS if you're braking normally and things aren't leaking. The corrosion and gunk build up settles in the valve and eventually you MAY have issues with it if original because of the cast iron and other metal parts inside corroding. Seals leaking, etc. Then you have to replace it or rebuild it. I do agree, 99% of all brake issues when doing a four disc conversion usually ends up with the master cylinder not being upgraded as well.

You're right about the corrosion. They don't leak, but I think most all of them are hopelessly frozen up by now. If anyone still wants, after reading my prior post in this thread, a rebuilt original Kelsey Haynes cast iron valve, complete, I just found one I had rebuilt off my ' 84 Camino, and never installed. I paid $100.00 for it to be rebuilt in 2018 by Old Auto Restorations in Lititz, Pa. You can have mine for $55.00, including shipping, anywhere in the U.S.

 

[Neill]

It's hard to say how they compare to the GM stuff. GM never built a thing, they had some vendor make it. So it's possible Bendix or someone else made the valves, which made valves for everyone else as well. Meaning same part. But again, maybe not. It's hard to tell when there's no tell-tale markings. I do know that it wasn't long after G-body production the valves went to brass.

OEM cats doesn't sell squat. They list where you can find the items mostly, but their data isn't always up to speed. That combo valve is no longer available at GM parts giant as their website no longer shows it as an available part.

SO........it's gone. Secondary markets if you can find them. Problem is trying to actually find a genuine GM one.
[/QUOT

 

[Neill]

The genuine G.M. parts are shipped in their original boxes or sealed bags. Always verify from the vendor of this before ordering, it also helps insure the parts are untampered with.

 

[mc1984ss]

You're right about the corrosion. They don't leak, but I think most all of them are hopelessly frozen up by now. If anyone still wants, after reading my prior post in this thread, a rebuilt original Kelsey Haynes cast iron valve, complete, I just found one I had rebuilt off my ' 84 Camino, and never installed. I paid $100.00 for it to be rebuilt in 2018 by Old Auto Restorations in Lititz, Pa. You can mine for $55.00, including shipping, anywhere in the U.S.

I'll take it if still available!!!!!