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1972 Disc Brake Proportioning Valve

Bob Nossal

Dodgefor72
Local time
6:24 PM
Joined
Jul 16, 2017
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Location
Milford, MI
Anybody still running their original cast iron disc brake proportioning valve. I am thinking about getting mine professionally restored unless someone has other recommendations.
 
I recently rebuilt the one on my 73. Pretty easy to do. Worked great when done.
 
Paul_G did you use a kit from Nacho-RT74 suggestion of muscle car research and if so which one did you use? There are several listed for the iron valves.
 
I did use the muscle car research kit. There instructions online are very good. They didn't have exactly the right one for my 73. But the kit had most of what I needed. I'll get the part number later today.
 
Nowdays the kit is more complete than when I got it. Althought I still haven't used it on my dist block because my car is STILL in pieces. It seems now the parts for the front section of the block are available. when I got it just the differential pistons O rings and the prop valve section were available.

It's nice all this O rings are available now as a kit, but actually you could allways get those O-rings in the past, just they are in an special Rubber able to support the brake fluid. Not any kind of rubber is able to live on brake fluid. Having them on a kit you don't need to guess anymore which one you really need.
 
I decided to send it out. It will be sleeved and restored by a place in VA. They did my master cylinder.
 
On my '72 Satellite Sebring Plus I had to disconnect the wire to the valve because the brake warning light was always on (still works with the parking brake). Disc brakes work fine.
 
On my '72 Satellite Sebring Plus I had to disconnect the wire to the valve because the brake warning light was always on (still works with the parking brake). Disc brakes work fine.

have you checked if the brake fluid gets emptied from the big bowl and overflows to the small bowl at master cylinder?

tipically a diferential piston makes to keep on the light on cluster when its O rings failed. Then the brake fluid goes through to change from one to the ither deposit due the diff pressure applied by the pistons on master cylinder.


Don’t ask how I know it LOL
 
Paul-G If you could furnish me with which one you used that would be great! Would love to go through this unit, the rest of the system is new and could never find parts for the metering/proportioning valve.
 
you should be able to reset that brake light either by pushing the button on the valve (if it has one) or by blocking an outlet and applying the brake pedal.

I've had to do it a couple of times but not sure if the above procedure is 100% what I remember doing.
 
you should be able to reset that brake light either by pushing the button on the valve (if it has one) or by blocking an outlet and applying the brake pedal.

I've had to do it a couple of times but not sure if the above procedure is 100% what I remember doing.

That procedure does work if the prop valve is in good shape. Mine was so crudded up the spool would barely move. I was not getting much rear brake action either till I rebuilt the prop valve.
 
Going through the same thing and Nacho helped steer me in the right direction.

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