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09-23-2012, 09:21 AM
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#1 |
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Registered User
Join Date: Nov 2010
Location: saraland al
Posts: 102
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72 proportioning valve
I know this should go under the brake forum but I'm not getting any response over there. I have a proportioning valve from a 72 and it doesn't have a button to re-center the shuttle valve in it, it just has a plug in the end. Anyone had a problem with one of these? how do you re-center it?
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09-23-2012, 09:57 AM
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#2 |
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Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: 72 proportioning valve
Remove the plug. The button should be under it. To recenter mine, I just stomped on the brake peddle a few times until it "popped" back into place.
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-Scott- |
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09-23-2012, 10:07 AM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
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Re: 72 proportioning valve
I found this. Did you do a search?
http://67-72chevytrucks.com/vboard/s...d.php?t=336053 |
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09-24-2012, 09:34 AM
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#4 |
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Registered User
Join Date: Nov 2010
Location: saraland al
Posts: 102
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Re: 72 proportioning valve
Tried all that and installed another valve. I think the new MC is bad on the front side. Going to replace it today and see if it fixes the problem.
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09-24-2012, 09:43 AM
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#5 |
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67-72 parts collector,…
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,701
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Re: 72 proportioning valve
Do you have any pics of your M/C set up?
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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09-24-2012, 12:50 PM
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#6 |
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Registered User
Join Date: Nov 2010
Location: saraland al
Posts: 102
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Re: 72 proportioning valve
Don't have a pic, I'm at work right now.
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09-24-2012, 01:11 PM
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#7 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 72 proportioning valve
Hmm... I have the same valve, though brand new, since I'm converting over to '72 discs. I was not aware there was any magic in terms of setting these up, I thought you just plumbed them and bled them.
I'm guessing there is a shuttle valve that can stuck to one end and cause problems, but beyond that I have no idea. Would someone be so kind as to tell me what it is that I don't know? I'll refer to the shop manual when the time comes, but helps if I know in a general sense what's going on. Sort of like finding out one day that there are muffler springs and you had no idea!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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09-25-2012, 12:10 PM
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#8 |
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Registered User
Join Date: Nov 2010
Location: saraland al
Posts: 102
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Re: 72 proportioning valve
The proportioning valve has a centering valve I believe it is called. This valve is in case you severe a brake line or blow out something the pressure from the good side of the brake system will force it in the opposite direction to cover the port on the low pressure, or blown out side so you still have some brakes. I have never had this issue while bleeding a brake system before but until the system is bled and the pressure is equal on each side there is the possibility of this happening. There is a tool designed to go in place of the brake switch while bleeding to prevent this from happening, I found a picture of one on the net. I seem to have it fixed, not sure what it was changed the MC and cleaned the prop valve.
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