Proportioning valve question for disc brake conversion

[RustyRatRod]

Yes it is a dual reservoir, saw two videos of someone just hooking it into the rear brake line in between the master and the stock combination valve. So i think im gonna do it that way.

If you have drum brakes all around, it's a distribution block, not a combination valve. Also, unless the line coming from the master cylinder goes STRAIGHT to the rear brakes and does not go into the distribution block, I don't believe you can just put it in the line going TO the distribution block. That would control more than "just" the rear brakes, I believe. It must be in the rear line alone in order to control pressure to the rear. I believe that's correct. If I am mistaken, I will count on my comrades to correct me. Regardless, I would still put it in the rear line, since that's all I would want to control. ......but then as I mentioned earlier, I would use all the factory stuff like I did on mine. Makes it much easier. Good luck with it.

 

[Jim Kueneman]

Best tutorial I have found.

 

[Dfr360cuda]

So… I did the front disc swap on my 68 recently. I’d planned an adjustable valve but having second thoughts.
Is the factory prop valve a direct replacement with the distribution valve ?

 

[Dfr360cuda]

New direction

 

[salinaguy]

These pictures may help you.

View attachment 1715931275

View attachment 1715931276

View attachment 1715931277

This helps a lot, Thank u! I like the location and install!

 

[64_Barracuda]

Drum brakes benefit from a proportioning- disc brakes do not.

You have it backwards

 

[67Dart273]

You have it backwards

Actually neither one of you are right or wrong, as, poorly stated

The fact is whether or not you need proportioning depends on weight bias, tires, sizes of brakes whether drum or disc, and so on. A vehicle, light in the rear, with large rear tires and lots of traction, might just need a prop valve with all drum brakes. Or, with front disc/ rear drum, and the same situation, "may not."

And the same may be true (may or may not need) with ANY system, all drum, disk / drum, or all disk.

We are of course also throwing vehicle mods in the mix, meaning mismatched brake components.

IN FACT I AM FIGHTING THAT RIGHT NOW on my 04 GMC. I bypassed the ABS because the brakes sucked and I was having trouble getting them to do much. After converting to hydroboost, and a few other things, I now have a Willwood prop valve to the rear disk, and IT IS NOT ENOUGH. For some reason the rear disks lock up much easier than they should.

 

[Brooks James]

Is the Chrysler original proportioning valve ajustable?
It seems to me that my rear brakes lock before my front disks.

Factory 8 3/4 axle brakes are known to lock up, there's a thread here about it , change wheel cylinders