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#1 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,688
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Rebuild service for combination/proportioning valve
Does anybody on the forum offer rebuild services for 71-72 combination/proportioning valve or know of a service from a vendor? I would be more interested in an original 71-72 combination valve that has been rebuilt than a new square looking brass one that are offered nowadays. I am not opposed to the new brass ones, but I am a little concerned about it being correct for a long bed C-10 with disc in front and drum in back because they are usually listed as suitable for general purpose GM disc/drum setup. I posted a want ad for one here but thinking of sending it out for rebuild if I get somebody offering me one. http://67-72chevytrucks.com/vboard/s...d.php?t=833978
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#2 |
Registered User
![]() Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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Re: Rebuild service for combination/proportioning valve
Illegal for a business to rebuild or tamper with in the State of California.
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#3 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,688
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Re: Rebuild service for combination/proportioning valve
Interesting the things they decide to make laws about. It must pay pretty good to be a politician and dream this stuff up... I wonder if they now stop traffic at the border to check and confiscate fresh fruit AND rebuilt proportioning valves coming into the state.
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#4 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,384
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Re: Rebuild service for combination/proportioning valve
Quote:
For the OP, here is a link to kits. They really aren't that difficult to do. https://www.google.com/search?q=71-7...client=gws-wiz
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#5 | |
Senior Member
![]() Join Date: Jan 2009
Location: Logansport,In
Posts: 546
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Re: Rebuild service for combination/proportioning valve
Quote:
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#6 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,858
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Re: Rebuild service for combination/proportioning valve
You could always go with an adjustable one if you are worried about the proper loading. I do not know what brand the one is on my 70, but when it was converted to front disk brakes (Stainless Steel Brakes Kit) it was provided with the kit to get the proper balance feel.brake
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#7 |
Registered User
![]() Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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Never seen business/company advertise or sell rebuild. Info came from Power Brake Sales Sacramento California.
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#8 |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Rebuild service for combination/proportioning valve
Old Auto Restorations https://oldautorestorations.com/ advertise they rebuild them. Gonna give them a shot at mine at some point when I get to it.
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72 C10 lwb fleetside -stock 350/350 combo |
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#9 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,234
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Re: Rebuild service for combination/proportioning valve
I have a brand new one that leaks from the plastic terminal for the brake light.
It requires rebuilding. One mile on the truck. Aggravating Last edited by Accelo; 05-07-2022 at 10:30 PM. |
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#10 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,149
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Re: Rebuild service for combination/proportioning valve
I used to go to big Corvette shows and there were vendors that bought cores and rebuilt them. Vette Brakes and Products is out of business now. Lonestar calipers might. Maybe Muskegon Brakes? That one is really not all that special, GM disc/drum is used in a bunch of cars and trucks for years. But I know what you mean. The one on my '83 K20 is stuck and I bought an aftermarket one but I can't quite bring myself to install it yet.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#11 |
Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,188
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Re: Rebuild service for combination/proportioning valve
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#12 |
Registered User
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Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,008
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Re: Rebuild service for combination/proportioning valve
Found these ads in Hemmings:
James Ament oldautorestorations@gmail.com Restore your brake proportioning valve back to like-new operating condition, rebuilding valves from the 60's through the early 90's. White Post Restorations, www.whitepost.com they show proportioning valve rebuilding as one of their services.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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#13 | |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,688
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Re: Rebuild service for combination/proportioning valve
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#14 |
Senior Member
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Location: Cypress, TX
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Re: Rebuild service for combination/proportioning valve
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#15 |
Who Changed This?
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Location: Simi Valley, CA
Posts: 10,384
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Re: Rebuild service for combination/proportioning valve
The specs are on one of these pages that Keith Seymour provided awhile back.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#16 | |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,234
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Re: Rebuild service for combination/proportioning valve
Quote:
I was shopping for a different brand and didn't have much luck as they all seem to be identical. I attempted to repair the leak. I unscrewed the top fitting where the elect connection goes and replaced the "O" ring. No joy it still leaks. Later I got some help, to pump the brakes, and found the front screw in plug also leaks. i see where Inlinetube sells the 1971-77 GM Disc Drum Proportioning Valve Lead Wire (Switch Only) for $12. If I thought it would fit the issue I would purchase one. I believe the brass header must have a burr in the hole. Even if it fixed the leak I would still have the other one to deal with so I changed my mind. I included a link to the lead wire switch; https://www.inlinetube.com/products/...13202138857533 A picture is also included of my installed valved with the leaking areas marked. Last edited by Accelo; 05-11-2022 at 11:06 AM. |
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#17 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,484
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Re: Rebuild service for combination/proportioning valve
So is it also illegal to replace other brake components like master cylinders, calipers, etc. that aren't OE? I mean, nothing CA lawmaker do would surprise me, but still...
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#18 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,234
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Re: Rebuild service for combination/proportioning valve
In my limited research I failed to find the law that addressed this;
Illegal for a business to rebuild or tamper with in the State of California. If anyone can find a link to the statutes it would be appreciated. I did find information on how to rebuild the 1978 - 1982 GM 1257208 Combination Valve Rebuild; https://www.musclecarresearch.com/gm-1257208-rebuild And the rebuilding kit here; https://www.musclecarresearch.com/gm-pd-valve-kit-3 |
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#19 |
Senior Member
![]() Join Date: Dec 1999
Location: Southern California
Posts: 2,802
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Re: Rebuild service for combination/proportioning valve
Here in California no one seems to want to fix parts. They just replace them with sometimes faulty remanufactured parts. Unfortunately to make money, good parts are changed as well. My BIL had his OE calipers changed out with some crappy remans some time back. FWI he was told they could not be rebuilt due to state law. Another reason I do everything I can myself.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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#20 | |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Rebuild service for combination/proportioning valve
Quote:
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72 C10 lwb fleetside -stock 350/350 combo |
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#21 | |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,149
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Re: Rebuild service for combination/proportioning valve
Quote:
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#22 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,384
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Re: Rebuild service for combination/proportioning valve
I used to rebuild calipers, master and wheels cylinders when I worked as a mechanic. I can't picture even California sorting that deeply into the pile for something to outlaw. I expect that people wanting to just replace the part, even with a reman, are doing it because it is more profitable. We used to send carburetors out for rebuild by a local shop, because they were really good at it, and it would be less cost effective for one of us to do it in-house.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#23 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,436
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Re: Rebuild service for combination/proportioning valve
MARKDTN wrote, "That is a Corvette one so it is 4 wheel discs. Might be the same parts as a disc/drum, but I doubt it."
I believe MARKDTN is correct from the simple fact that the Combination Valve shown does NOT include a Metering Valve on the end for the Front brakes.
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'67 GMC 2500, 292, 4spd, AC |
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#24 |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Rebuild service for combination/proportioning valve
The stock cast iron valves are fine, it's the brass ones that are notorious for leaking from the metering valve. I bought the Wilwood combo valve, but haven't installed it. I'm leaning towards using a rebuilt stock combo valve instead....but I'm still undecided. The metering valve RichardJ shows above is a replacement for the leaky brass valves. Which leads me to ask, does anyone know how to remove the metering valve from a stock Bendix combo valve? I'll be attempting to rebuild my stock valve in the near future.
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72 C10 lwb fleetside -stock 350/350 combo Last edited by 68 P.O.S.; 05-13-2022 at 10:54 AM. |
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#25 |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Rebuild service for combination/proportioning valve
That's because there isn't one. Word around the campfire is the brass valves are originally from late 70s/early 80s Camaros. The only real options I see are to rebuild a stock combo valve, or ditch the combo valve all together and install an adjustable proportioning valve.
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72 C10 lwb fleetside -stock 350/350 combo Last edited by 68 P.O.S.; 05-13-2022 at 10:55 AM. |
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