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Jon H


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Proportioning valve question
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P valve 001.JPGMy brake system proportioning valve has a small plunger on the rear side that used to covered by a rubber boot which has long since detiorated.  I was wiping it off the other day and now I get a very slow drip out of the plunger.  Anyone know the purpose of the plunger and how one would stop the drip?  headscratch



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'69 Convertible,  Lemans Blue, 454, 200 4R, 12 Bolt. 

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yellowbowtie


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The plunger is like a reset button for your rear brakes. I would bet the rust on the plunger damaged the o-ring that is why its leaking. I would replace the valve. I was looking on line and did not see any form of rebuild kit for those.

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Ian M  St louis Park
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That's a hold-off valve for the front brakes....has nothing to do with the rears. It holds off pressure momentarily to the fronts so the rears have time to engage first. Buy a new one from in-line tube they look identical to original.

http://inlinetube.com/Prop%20Valves/PR-105.htm

 



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Mitch D.   River Falls, WI

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Chris R


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Ive never heard of any rebuild kit for those either but I have heard of shops that will rebuild them. Its not worth having one rebuilt when a new replacment is available. You might even be able to find one locally and save on the shipping cost.



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Chris - Ramsey, MN.

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Jon H


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Can't find one locally, O'rielly, Advance, NAPA, etc. If anyone knows of a possible local source I am open.  I will check with Bryan tomorrow and see if it is available from GM.  Checking the net, they run from $62.90 to $169 for the same part number. It does pay to compare pricing.  Inline tube had a reasonable price with the bracket included.

After the initial post I did some resaearch and learned it is a hold off valve, not a proportioning valve, Mitch is right, AGAIN.  notworthy



-- Edited by Jon H on Sunday 12th of August 2012 10:13:51 AM

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SShink


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I would guess Auto City Classics near you would have one since they have the drum to disc conversion kits. 



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Jon H


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SShink wrote:

I would guess Auto City Classics near you would have one since they have the drum to disc conversion kits. 

 Good thought!



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'69 Convertible,  Lemans Blue, 454, 200 4R, 12 Bolt. 

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RICKS70SS


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JON: Did you try Rock auto; Not sure if they deal in that. But it could be worth while. But if Auto city has it. You could save on shipping co$t

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Tim H


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I checked with Denny at Auto City a while back and they did not have them at that time

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Tim H wrote:

I checked with Denny at Auto City a while back and they did not have them at that time

That's what I was thinking but didn't want to say it yet. I believe most modern conversions include a prop valve that does it all. The early systems used this hold-off and a distribution block together. I've only found this part at in-line. Shipping sucks at 8-12 bucks but it gets the part to your door. No $4 gallon gas used chasing around....dunno

 



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Mitch D.   River Falls, WI

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Chris R


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Brake and Equipment warehouse in Minneapolis has restoration services and also has a lot of brake parts from everything from common cars of today to hard to find stuff. Might try calling them and see if they can help.



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Chris - Ramsey, MN.

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