Stock proportioning valve w/ disc brake conversion

[tiredtiretodd]

Does anyone know if you have to depress the pin on the proportioning valve to bleed the rear brakes? Also how do you go about properly bleeding them?

 

[marks86]

Does anyone know if you have to depress the pin on the proportioning valve to bleed the rear brakes? Also how do you go about properly bleeding them?

I just re bled them normally, Don't think I even had to do the fronts

I didn't do anything with the proportioning valve at first I did bleed the brakes

 

[tiredtiretodd]

I just re bled them normally, Don't think I even had to do the fronts

I didn't do anything with the proportioning valve at first I did bleed the brakes

Thanks Mark, I'm gonna bleed them and see what happens.

 

[marks86]

no problem let us know how it worked out

 

[cbrodine]

did you convert from a disc/drum setup to a disc/disc setup? If so, you shouldn't being using the then stock prop valve...you'll need a disc/disc prop valve for proper use.

 

[marks86]

did you convert from a disc/drum setup to a disc/disc setup? If so, you shouldn't being using the then stock prop valve...you'll need a disc/disc prop valve for proper use.

whats the difference?

 

[cbrodine]

Pressure....disc brakes operate at different pressure then drum brakes. That's why there are proportioning valve's for drum/drum, disc/drum and disc/disc. I found a GM style disc/disc prop valve for $35 on eBay. I did a rear disc brake conversion on my 73 GMC C 25 w/a 14 bolt FF. Get a disc/disc valve, it's cheap and will bolt right in place of the original.


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[crazy4offroad]

I added an adjustable prop valve to mine and it seemed unnecessary. It all depends on your setup, with my 1-tons and huge tires the increased clamping force on the back is welcomed, much less nose-dive on braking than before.

Posted MOBILE!

 

[tiredtiretodd]

i ended up not doing anything and they work fine, just needed to drive it and pump the brakes up. As for the prop valve, i don't think it was ever changed, it looks like the original and the rear discs are working

 

[PrairieDrifter]

Your rear brakes won't wear at the same rate as the front brakes without the right proportioning valve, which isn't that big of a deal but if I did a disc swap in the rear I would do it right to get the max life and performance from the uprgade, but that's just me!

 

[tiredtiretodd]

I was fortunate to buy the truck with the discs already installed on the rear. Now I will most likely install a disc/disc prop valve that is adjustable. The problem I'm running into now is that I don't have a ebrake.