Proportioning valve ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dave666693 · 07-23-2011, 10:54 PM

Will a disc brake proportioning valve work OK on drums front and rear?

fastwillie 696969 · 07-23-2011, 11:00 PM

its a disc to disc PV or is it disc and drum PV ,i would think it would work being disc pv .

Lee H · 07-23-2011, 11:48 PM

Please don't mix brake parts. You need those important safety parts to work correctly. Each brake component is designed and manufactured for a specific purpose and should not be mixed up. Easier to find the right part than to recover from an accident.
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**special-K** · 07-24-2011, 06:28 AM

Drum brakes and disc brake require different pressure characteristics and the purpose of the proportioning valve is to keep the pressure in the proper "proportion" in the two separate sides of the system controlled by one master cyl.

**Daddy Brim** · 07-24-2011, 11:39 AM

Quote:

Originally Posted by Lee H

Please don't mix brake parts. You need those important safety parts to work correctly. Each brake component is designed and manufactured for a specific purpose and should not be mixed up. Easier to find the right part than to recover from an accident.
Posted via Mobile Device

Quote:

Originally Posted by special-K

Drum brakes and disc brake require different pressure characteristics and the purpose of the proportioning valve is to keep the pressure in the proper "proportion" in the two separate sides of the system controlled by one master cyl.

I agree with this .

**lolife99** · 07-24-2011, 12:06 PM

Drum brake trucks have a distribution block.
It's not a proportioning valve.
Meaning,... it doesn't regulate the front vs rear brake pressures,... it just sends fluid to the 4 wheels.
Use the correct parts on your drum brake truck.

Gene · 07-24-2011, 12:12 PM

What about using differentials from a truck that came with anti-lock brakes? Will the discs work fine with a stock 71 setup?

mbgmike · 07-24-2011, 12:23 PM

Quote:

Originally Posted by dave666693

Will a disc brake proportioning valve work OK on drums front and rear?

as stated use the correct part. Prop valves send 70% to the front and of course 30% to the back. Disc brakes need more pressure up front than the rears. So all you are doing is sending that to the front on drums which is not needed. the part is not expensive so use the correct one

mbgmike · 07-24-2011, 12:25 PM

Quote:

Originally Posted by Gene

What about using differentials from a truck that came with anti-lock brakes? Will the discs work fine with a stock 71 setup?

abs will not matter at all.but you will need to go to the correct prop valve

07-23-2011, 10:54 PM	#1
dave666693 Registered User Join Date: Jul 2005 Location: Edgewood, WA Posts: 899	Proportioning valve ?? Will a disc brake proportioning valve work OK on drums front and rear? __________________ 67 C20/ 68 C10 stepside/inline 250--current project 71 GMC 4x4 70 Blazer project-Zombie assault vehicle 67 4x4 Burb

07-23-2011, 11:00 PM	#2
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Proportioning valve ?? its a disc to disc PV or is it disc and drum PV ,i would think it would work being disc pv . __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

07-23-2011, 11:48 PM	#3
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,139	Re: Proportioning valve ?? Please don't mix brake parts. You need those important safety parts to work correctly. Each brake component is designed and manufactured for a specific purpose and should not be mixed up. Easier to find the right part than to recover from an accident. Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

07-24-2011, 06:28 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Proportioning valve ?? Drum brakes and disc brake require different pressure characteristics and the purpose of the proportioning valve is to keep the pressure in the proper "proportion" in the two separate sides of the system controlled by one master cyl. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

07-24-2011, 12:06 PM	#6
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,682	Re: Proportioning valve ?? Drum brake trucks have a distribution block. It's not a proportioning valve. Meaning,... it doesn't regulate the front vs rear brake pressures,... it just sends fluid to the 4 wheels. Use the correct parts on your drum brake truck. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

07-24-2011, 12:12 PM	#7
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: Proportioning valve ?? What about using differentials from a truck that came with anti-lock brakes? Will the discs work fine with a stock 71 setup?



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