brake prop valve choice for disc conv on 72 c10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mole2000 · 09-14-2008, 12:52 AM

I picked up this brake prop valve today. It came off a 1991 c1500 with RWAL. can i use it for my disc conversion on my '70 c10?
thanks,
tim

cdowns · 09-14-2008, 07:25 AM

disc conversion???? all trucks starting in 71 came with disc brakes

LONGHAIR · 09-14-2008, 07:44 AM

I think he is refering to rear brakes? ....but my initial thought is no. I would not mix anti-lock parts into a non anti-lock system.

**Boog** · 09-14-2008, 09:05 AM

But the 91 had rear drum brakes too.

mole2000 · 09-14-2008, 09:35 AM

Sorry- it was late. And I had some problems thinking. I have a 1970 C10.

Longhorn Man · 09-14-2008, 12:53 PM

Mole, personally, i would either use a 71/72 piece, or, stick with your stock distribution valve on the drum/drum set up, and install an adjustable prop valve in the rear line, and then fine tune it all to where it is perfect.

Sinisterspeed · 09-14-2008, 01:54 PM

mole2000 · 09-15-2008, 09:31 PM

i will heed this sage advice. I looked to be sure and mine has no prop valve at all. I guess with drum/drum it didnt matter. I'll pick up one of the adjustable units.

Thanks all.

Ford Assassin · 03-03-2009, 02:14 AM

Quote:

Originally Posted by Longhorn Man

Mole, personally, i would either use a 71/72 piece, or, stick with your stock distribution valve on the drum/drum set up, and install an adjustable prop valve in the rear line, and then fine tune it all to where it is perfect.

I didn't know you could re-use the stock drum/drum proportioning valve when converting to front disc brakes.

I am in the process of finishing my disc brake swap on my '69 and I have a used '71-'72 booster, master cylinder, and stock disc proportioning valve. However the stock drum rear line that would go to the disc proportioning valve isn't even close to where it needs to be.

spinning wheels · 03-03-2009, 02:46 AM

Ford Assassin, look up Classic Performance Products, (CPP). I am running their proportioning valve and it works fine. They also sell refurbished factory proportioning valves, but they cost more than their own product line.

I think you might run into the same problem that you have now, the proportioning valve being too far from your rear brake lines. Would it be feasible to change out the rear brake lines?

Like Longhorn said, you can also run what you have and add an adjustable proportioning valve. I believe Wilwood brakes makes a proven product.

Ford Assassin · 03-03-2009, 02:51 AM

Quote:

Originally Posted by spinning wheels

Like Longhorn said, you can also run what you have and add an adjustable proportioning valve. I believe Wilwood brakes makes a proven product.

So if I run what I have already, do I bypass the rear line from the block and just run it into the adjustable proportioning valve? Or do I run the proportioning valve before or after the factory drum block?

Longhorn Man · 03-03-2009, 05:13 PM

the drum/drum piece is not a proportioning valve at all, just a distribution valve with a pressure switch and warning sensor. A stock 71/72 prop valve would be fine, you may have to rebend/add to/replace the line you are having issues with. If you want to add an adjustable one, I think adding it after the distribution valve would be best, that way the dash warning light isn't triggered.

09-14-2008, 12:52 AM	#1
mole2000 Registered User Join Date: Aug 2008 Location: Austin, Texas Posts: 78	brake prop valve choice for disc conv on 1970 c10 I picked up this brake prop valve today. It came off a 1991 c1500 with RWAL. can i use it for my disc conversion on my '70 c10? thanks, tim Attached Images Last edited by mole2000; 09-14-2008 at 09:44 AM. Reason: input incorrect year model

09-14-2008, 07:25 AM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: brake prop valve choice for disc conv on 72 c10 disc conversion???? all trucks starting in 71 came with disc brakes __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-14-2008, 07:44 AM	#3
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: brake prop valve choice for disc conv on 72 c10 I think he is refering to rear brakes? ....but my initial thought is no. I would not mix anti-lock parts into a non anti-lock system.

09-14-2008, 09:05 AM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,559	Re: brake prop valve choice for disc conv on 72 c10 But the 91 had rear drum brakes too. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

09-14-2008, 09:35 AM	#5
mole2000 Registered User Join Date: Aug 2008 Location: Austin, Texas Posts: 78	Re: brake prop valve choice for disc conv on 72 c10 Sorry- it was late. And I had some problems thinking. I have a 1970 C10.

09-14-2008, 12:53 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: brake prop valve choice for disc conv on 72 c10 Mole, personally, i would either use a 71/72 piece, or, stick with your stock distribution valve on the drum/drum set up, and install an adjustable prop valve in the rear line, and then fine tune it all to where it is perfect.

09-14-2008, 01:54 PM	#7
Sinisterspeed Registered User Join Date: Apr 2008 Location: Gales Creek, Oregon Posts: 619	Re: brake prop valve choice for disc conv on 72 c10 __________________ There are two kinds of people, those who finish what they start and so on. 70 GMC Longhorn (A.K.A Money Bucket) 57 Chev 3100 05 Chevy LLY Dmax. 67 Chevy Camaro Dad's Budget Build 55 My Longhorn Build

09-15-2008, 09:31 PM	#8
mole2000 Registered User Join Date: Aug 2008 Location: Austin, Texas Posts: 78	Re: brake prop valve choice for disc conv on 72 c10 i will heed this sage advice. I looked to be sure and mine has no prop valve at all. I guess with drum/drum it didnt matter. I'll pick up one of the adjustable units. Thanks all.

03-03-2009, 02:46 AM	#10
spinning wheels Registered User Join Date: Sep 2001 Location: Hacienda Heights, California USA Posts: 474	Re: brake prop valve choice for disc conv on 72 c10 Ford Assassin, look up Classic Performance Products, (CPP). I am running their proportioning valve and it works fine. They also sell refurbished factory proportioning valves, but they cost more than their own product line. I think you might run into the same problem that you have now, the proportioning valve being too far from your rear brake lines. Would it be feasible to change out the rear brake lines? Like Longhorn said, you can also run what you have and add an adjustable proportioning valve. I believe Wilwood brakes makes a proven product. __________________ '72 GMC custom camper 350/350 Last edited by spinning wheels; 03-03-2009 at 02:48 AM.

03-03-2009, 05:13 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: brake prop valve choice for disc conv on 72 c10 the drum/drum piece is not a proportioning valve at all, just a distribution valve with a pressure switch and warning sensor. A stock 71/72 prop valve would be fine, you may have to rebend/add to/replace the line you are having issues with. If you want to add an adjustable one, I think adding it after the distribution valve would be best, that way the dash warning light isn't triggered.

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