Proportioning Valve has me so confused?????

[Monziac]

I am doing the disc conversion to my 68 Charger right now.  It was a drum car and I purchased the spindle kit for disc set up.  I have ordered a new disc booster/master and I am now trying to identify what I need for a proportioning valve.  I have searched on here and there are so many differing answers, that I am utterly confused?  I still have the distribution block on the frame from my drum set up.  Do I keep it?  Do I add something onto it, or is it completely replaced with something?  I would appreciate the help and links to what I should buy for this. 

Thanks,
Jon

[Back N Black]

Which kit are you using?

[Monziac]

I purchased this kit, and it was very well constructed and went on without any issues:  https://www.performanceonline.com/62-74-MOPAR-Chrysler-Dodge-Plymouth-Disc-Brake-Conversion-Kit/

Thanks,
Jon

[John_Kunkel]

If you do need a prop valve, it would be most practical to leave the distribution block and install an adjustable prop valve in the rear line leading from the distribution block.

[ACUDANUT]

" I still have the distribution block on the frame from my drum set up"  You need a different one now.  You can buy these new or find one from a 70-74 car with front disk brakes.

[MSRacing89]

" I still have the distribution block on the frame from my drum set up"  You need a different one now.  You can buy these new or find one from a 70-74 car with front disk brakes.

The drum version does not have any proportion built into so it is not a problem running it.  You may consider adding an aftermarket adjustable valve on the rear line.  I run this block with the guts/ plunger removed.  I  prefer it this way that way I can control the bias.

[Monziac]

John, so the adjustable prop valve just limits the amount of flow to the rear brakes?  So I assume you just cut the line and double flare some tube and just interrupt after the block on the way back?  I assume this is what you are talking about?  http://www.ebay.com/itm/1964-70-Adjustable-Disc-Drum-Brake-Proportioning-Valve-Hot-Street-Custom-Rod-/200880310503?hash=item2ec56648e7&vxp=mtr  

I was hoping to get a single block like my 71 Buick GS has.  If I want to go that route does anyone sell a single block with the correct metering already built in?

Thanks,
Jon

[John_Kunkel]

The combination valve (or "single block" as you call it) requires a lot more tubing fabrication and the proportioning is engineered for one particular car (weight/bias). The adjustable, such as in the link you provided, allows you to tune the proportioning to your car and is easier to install.

[Monziac]

Makes sense, thank you!

[green69rt]

Ok, I'm going to throw a little wrinkle in here.  I've  seem something called a "hold-off-valve"  is that incorporated into any of the valves mentioned here or should I not worry.   

[John_Kunkel]

Mopar calls the hold off valve a "metering valve"....it's intended to delay the application of the front calipers until a pre-determined amount of pressure builds up in the rear brake system. It can be a separate component or part of a combination valve. Many do the disc swap without it, doesn't seem to matter.