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#1 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Centering proportioning valve. $60 proportion valve,
I just replaced my master cylinder and now I can't center my proportioning valve. I have searched the threads and tried everything I could find trying to get it centered. I tried opening both rear bleeders, both front bleeders, I tried slow pedal pressure, I tried fast pressure, I tried taking off the output lines right out of the prop valve and bleeding it there. Nothing I have tried will work. Is there something I'm missing? I have read that there is a pin on the front of the valve that needs to be held in when bleeding the brakes, I tried that, then I watched the pin while my wife pushed the brakes and the little pin never moves, it looks like it's all the way in. Is this my problem? Is that little valve supposed to be out? Mine is almost flush with the black plastic piece it sticks out of, it sticks out about 1/16".
So I'm confused, is that little steel piece the part that's supposed to be held in when bleeding the brakes? Since mine does not move, could that be why I can't center the valve and get the light out? I am thinking of just buying a new valve, I found one at "truck shop" that is labeled "GM replacement" for $60, have any of you used it? I would rather not spend $130 for one if I can avoid it (assuming I can't center mine) Thanks for any suggestions and information! Posted via Mobile Device Last edited by AirSpeed; 03-29-2011 at 12:25 AM. |
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#2 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Centering proportioning valve. $60 proportion valve,
Get lolife to see this thread, the guy is amazing with brakes/suspension..
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#3 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
Should I be able to move the little pin in and out, the little pin in the end of the proportioning valve? Mine seems to be in as far as it can go, it does not move when the brakes are depressed. It sticks out about 1/16th of an inch. I tried to pull it out with some pliers, it would niether pull out or go in.
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#4 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Should the pin in the end of the prop valve move?
Should I be able to move the little pin in and out, the little pin in the end of the proportioning valve? Mine seems to be in as far as it can go, it does not move when the brakes are depressed. It sticks out about 1/16th of an inch. I tried to pull it out with some pliers, it would niether pull out or go in.
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#5 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,442
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Re: Centering proportioning valve. $60 proportion valve,
The pin is part of the Metering Valve and has nothing to do with the Brake Light Switch.
If the Metering Valve or Hold-off Valve as it is also called is bad, the vehicle will nose-dive at low speeds with light brake pressure. It prevents pressure to the front disc brakes until the rear brakes reach about 40 psi. Your Combination Valve includes a Metering Valve, a Proportion valve and the Brake Light Switch. If one side (front or rear) fails, the pressure from the good side pushes the Switch piston to the other side, which should close off that line out of the conbination valve. That way if the problem is a leaking wheel cylinder, you are not pumping all the fluid out onto the ground. Have your wife push on the pedal. Crack one of the bleeders, front or rear. If you chose the right end of the truck, the light should go out, as soon as the pedal starts to drop. If that didn't do it, go to the other end of the truck and try again. If that doesn't work, you still have air in the lines and need to bleed again. Make sure you don't have a leak somewhere.
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'67 GMC 2500, 292, 4spd, AC |
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#6 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
I have bled the brakes six times now, I ran 1 1/2 quarts of fluid through the system. I have read here and in two repair manuals that the pin in the end of the valve has to be held in to bleed them properly, the pin in mine does not move, even when the brakes are pushed, it's almost flush with the end of valve, that's why I am wondering if mine has an issue. I'm trying to figure out if that pin is supposed to move when the brakes are depressed? As I said, mine does nothing so I'm wondering if its possible to bleed them if mine is bad.
I tried the the method you suggest several times with no luck. That's why I'm wondering if they are actually bleeding since the little pin I have been told needs to be held in is bad? Posted via Mobile Device |
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#7 |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: Centering proportioning valve. $60 proportion valve,
whats your problem
the brake light on.. try tapping on the valve with a hammer.. |
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#8 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Centering proportioning valve. $60 proportion valve,
does the light go off if you disconnect the wire? if not the wire is grounded
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#9 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: Centering proportioning valve. $60 proportion valve,
If I read the entire thread correctly, the issues are the brake light will not go out AND the valve pin does not move. Can't help with the brake light but I had the same issue with the pin. I read a thread that mentioned someone taking the valve apart, fixing the issue only to have the pin get stuck again. I decided to avoid those steps and just replaced the valve with an adjustable valve (http://www.summitracing.com/parts/WIL-260-11179/).
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#10 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
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#11 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
[QUOTE=Alex Hayley;4586483]If I read the entire thread correctly, the issues are the brake light will not go out AND the valve pin does not move. Can't help with the brake light but I had the same issue with the pin. I read a thread that mentioned someone taking the valve apart, fixing the issue only to have the pin get stuck again. I decided to avoid those steps and just replaced the valve with an adjustable valve (http://www.summitracing.com/parts/WIL-260-11179/).[/QU
Are the fittings all the same? I dont want to have a plumbing nightmare if I go that route. Does it connect to the dash light to let you know if theres a problem? Thanks! |
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#12 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
Well, I gave up and ordered a new combo valve, mine is definately no good.
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#13 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: Centering proportioning valve. $60 proportion valve,
When I did the disc brake conversion, I had the same problem and somebody on the board told me to stomp on the brake pedal as hard as I could while it was in Park. Sure enough the brake light went right out and re-centered it!
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#14 | |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
Quote:
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#15 |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: Centering proportioning valve. $60 proportion valve,
a little shot of air in the valve on the side it's stuck on.. and it be back to normal..
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#16 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Centering proportioning valve. $60 proportion valve,
I received my new combo valve and installed it yesterday. It came with the mount, two pre bent lines to connect it to my master cylinder and the little wire that connects to the warning light. It was a pleasure to install, the pre bent lines fit perfectly. Now my brakes are 100% new and man do they work great. My truck stops effortlessly now, before the rears would lock up and I dont think the fronts were doing anything. It's amazing what that little valve does and how much better it stops now that it's installed. It's the best $69 I've spent all week!
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#17 |
Registered User
Join Date: Nov 2009
Location: Osburn, Idaho
Posts: 28
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Re: Centering proportioning valve. $60 proportion valve,
Who did you buy the valve from on ebay? Tony
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#18 |
'85 Stepside
![]() Join Date: Jan 2006
Location: montgomery city mo.
Posts: 360
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Re: Centering proportioning valve. $60 proportion valve,
70c10 is correct. Also bleed at master cyl to center pin if the stomping don't work.
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