My 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?
yellowbowtie said
Aug 11, 2012
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.
Lost in the 60s said
Aug 12, 2012
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.
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.
Jon H said
Aug 12, 2012
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 $169 for the same part number. It does pay to compare pricing. Inline tube had a reasonable price with the bracket included.
After the initial post I did some resaearch and learned it is a hold off valve, not a proportioning valve, Mitch is right, AGAIN.
-- Edited by Jon H on Sunday 12th of August 2012 10:13:51 AM
SShink said
Aug 12, 2012
I would guess Auto City Classics near you would have one since they have the drum to disc conversion kits.
Jon H said
Aug 12, 2012
SShink wrote:
I would guess Auto City Classics near you would have one since they have the drum to disc conversion kits.
Good thought!
RICKS70SS said
Aug 12, 2012
JON: Did you try Rock auto; Not sure if they deal in that. But it could be worth while. But if Auto city has it. You could save on shipping co$t
Tim H said
Aug 12, 2012
I checked with Denny at Auto City a while back and they did not have them at that time
Lost in the 60s said
Aug 12, 2012
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....
Chris R said
Aug 12, 2012
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.
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
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.
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.
-- Edited by Jon H on Sunday 12th of August 2012 10:13:51 AM
I would guess Auto City Classics near you would have one since they have the drum to disc conversion kits.
Good thought!
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.