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Old 02-04-2018, 07:03 PM
Hubert Hubert is offline
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Default Propotioning valve question

1970 Chevelle SS, factory front disk/rear drum

Question, what would be the effect on the brakes if a newer combination valve were installed along with the rear pressure valve that came on these cars? I'm wondering if this might not have been done to my car as it does not like to stop.

I plan to rehab the brakes on the car once it warms up, possibly installing all new metal hard lines as the car sat up for decades with zero maintenance performed. I'm inclined to install a newer combo valve designed for disk/drum and do away with the rear valve. If I do this, does anyone know if an S10 pickup combo valve would work here? They look identical on the outside, but what's inside is what would matter here. Thanks.

This would be the rear valve I'm talking about.
https://www.summitracing.com/parts/rsd-pv68
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Old 02-04-2018, 11:30 PM
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shadowgray396 shadowgray396 is offline
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If I remember correct Disc brkaes only take 2 lbs and the rear drums take around 10 to work. even if you go 4 disc or drums you will need something hold pressure on the rear. But depending on your new set up you might be able to use a adjustable pressure valve with the new set up. .

Just found this
http://chevelleforum.org/picture.php...pictureid=4882

http://chevelleforum.org/picture.php...pictureid=4881
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1970 SS Chevelle Van Nuys Built

Last edited by shadowgray396; 02-08-2018 at 08:22 AM.
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Old 02-05-2018, 12:41 AM
Hubert Hubert is offline
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The intent would be to leave it with the factory front disk/rear drum setup. So regardless I will need these residual pressure valves on both the front and rear then, correct?
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Old 02-08-2018, 08:23 AM
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shadowgray396 shadowgray396 is offline
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Yes. You need something depending on the set you use.
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Old 02-08-2018, 10:05 PM
Hubert Hubert is offline
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Cool thanks. I'll investigate what's on there when it warms up a bit, and will make sure the residual pressure valves are in place.
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Old 02-10-2018, 07:22 PM
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Ken Hayes Ken Hayes is offline
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Hubert, this is where I got all my front disk conversion from.

https://www.getdiscbrakes.com/

You said something about using a proportioning valve along with what you have now..........DO NOT DO IT that way. As long as you have the right master cyl (a regular one for drum brakes wont work right) you connect the valve like in my pic and get rid of the one down on the frame.

If you need stuff to get it done you can get pieces from the company above. A ton of people use "Right Stuff Detailing" parts and are satisfied.
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