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Old 08-22-2016, 01:22 PM   #1
Moneymatt448
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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
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Old 08-22-2016, 09:49 PM   #2
dennislbrooks
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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.
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Old 08-22-2016, 09:54 PM   #3
Moneymatt448
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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 .
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Old 08-22-2016, 09:57 PM   #4
MikeB
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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.
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1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, 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.
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Old 08-22-2016, 10:04 PM   #5
Moneymatt448
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Re: What proportining valve do I need for disc / drum on 69 Chevy

Quote:
Originally Posted by dennislbrooks View Post
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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Old 08-23-2016, 10:54 AM   #6
dennislbrooks
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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.
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Last edited by dennislbrooks; 08-23-2016 at 10:57 AM. Reason: words
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