What proportining valve do I need for disc / drum on 69 Chevy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Moneymatt448 · 08-22-2016, 01:22 PM

I have a 69 Chevy c10 that had drum / drum set up I switched it to 72 disc / drum set up but I need help picking the right proportining valve do I have to add extra break lines or can I just use the existing ones from the drum drum set up
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**dennislbrooks** · 08-22-2016, 09:49 PM

On my 67 I also went to 72 disc but I kept the original 67 front rear brake splitter and plummed in an adjustable proporting valve in the rear line that I could adjust from inside the cab. I also changed the master cylinder to an 82 vette - 72 c10 would be ok also. Speedway also says to run a residual valve on the rear brakes if drums , I did not. When I went to disc all the way around all I had to do was readjust my rear brake valve.

Be safe and test your brakes before venturing into normal traffic.

Moneymatt448 · 08-22-2016, 09:54 PM

I bought a 73 booster master cylinder was going to just install that one and get a new proportioning valve .
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**MikeB** · 08-22-2016, 09:57 PM

I wouldn't add a valve unless the rear brakes lock up under heavy braking.

Moneymatt448 · 08-22-2016, 10:04 PM

Quote:

Originally Posted by dennislbrooks

On my 67 I also went to 72 disc but I kept the original 67 front rear brake splitter and plummed in an adjustable proporting valve in the rear line that I could adjust from inside the cab. I also changed the master cylinder to an 82 vette - 72 c10 would be ok also. Speedway also says to run a residual valve on the rear brakes if drums , I did not. When I went to disc all the way around all I had to do was readjust my rear brake valve.

How did you plum it in
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**dennislbrooks** · 08-23-2016, 10:54 AM

It is a knob style adjustable proportioning valve. Like speedway part number 910-31353.

remove rear brake line from oem splitter valve. use splice if needed to run line to the out side of the knob valve. run a new short line from in side on knob valve back to oem splitter valve. mount under dash. will show a pics.

73 master cylinder should be ok.

08-22-2016, 01:22 PM	#1
Moneymatt448 Registered User Join Date: Aug 2016 Location: San Antonio Texas Posts: 10	What proportining valve do I need for disc / drum on 69 Chevy I have a 69 Chevy c10 that had drum / drum set up I switched it to 72 disc / drum set up but I need help picking the right proportining valve do I have to add extra break lines or can I just use the existing ones from the drum drum set up Posted via Mobile Device

08-22-2016, 09:49 PM	#2
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: What proportining valve do I need for disc / drum on 69 Chevy On my 67 I also went to 72 disc but I kept the original 67 front rear brake splitter and plummed in an adjustable proporting valve in the rear line that I could adjust from inside the cab. I also changed the master cylinder to an 82 vette - 72 c10 would be ok also. Speedway also says to run a residual valve on the rear brakes if drums , I did not. When I went to disc all the way around all I had to do was readjust my rear brake valve. Be safe and test your brakes before venturing into normal traffic. __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 08-22-2016 at 10:03 PM.

08-22-2016, 09:54 PM	#3
Moneymatt448 Registered User Join Date: Aug 2016 Location: San Antonio Texas Posts: 10	Re: What proportining valve do I need for disc / drum on 69 Chevy I bought a 73 booster master cylinder was going to just install that one and get a new proportioning valve . Posted via Mobile Device

08-22-2016, 09:57 PM	#4
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,597	Re: What proportining valve do I need for disc / drum on 69 Chevy I wouldn't add a valve unless the rear brakes lock up under heavy braking. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

08-23-2016, 10:54 AM	#6
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: What proportining valve do I need for disc / drum on 69 Chevy It is a knob style adjustable proportioning valve. Like speedway part number 910-31353. remove rear brake line from oem splitter valve. use splice if needed to run line to the out side of the knob valve. run a new short line from in side on knob valve back to oem splitter valve. mount under dash. will show a pics. 73 master cylinder should be ok. Attached Images __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 08-23-2016 at 10:57 AM. Reason: words

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