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Old 03-09-2009, 05:08 AM
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'54 Chevy and disc/drum conversion

I am changing a '54 Chevy over to disc/drum and have the following components - 7" booster, early Vette master cylinder, GM A body discs and calipers in the front and a Nova rear end with drums. I also plan on using a 10 lb residual valve in the rear line and a 2 lb valve in the front line since the booster and master is under the floor mounting on the frame. My question is should I use an adjustable proportioning valve in the rear or use a combination valve from a donor car or the aftermarket. Are the aftermarket combination valves one size fits all? Also if using the adjustable proportioning valve, is a metering valve necessary. I have seen numerous diagrams both with and without metering valves.

Thanks for any input.

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Old 03-09-2009, 09:52 AM
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I have always been hesitant to use an after-market combo valve. Without knowing the specifics of the vehicle (tire combo, weight distribution, c/g location, etc) it would be a crap-shoot to get the right one. With at setup like you have, I would be very comfortable installing the components you describe and just installing the adjustable proportioning valve with no metering valve. I have done it that way many times and as long as the braking components are a well balanced brake package (don't install 13" rotors and 6 piston calipers on the front and 10" drums on the rear), and your tire/wheel dimensions are similar front to rear, you should be able to adjust the balance just fine.

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Old 03-09-2009, 10:12 AM
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Thanks aosborn!
The main thing I was worried about was/if I needed a metering valve.
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