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Topic: Proportioning valve?? (Read 208 times)
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440WIP
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Took a look in the tech pages - I was wondering if I upgrade to 4.5" disc brakes on a car that has the 4"disc brakes, do I need to upgrade to a proportioning valve from the 4.5" set up? In addition, If I later put discs on the rear instead of drums, do I need a different proportioning valve as well?
Daryl
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Logged
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"This big block thing is starting to get expensive"
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farmington
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Why do people keep calling the "DISTRIBUTION BLOCK" a proportioning valve? It isn't. But yes, it is a good idea to use the one that came with the brakes you are using. 2- Don't waste your money on rear discs unless you're trying to stop a 150 mph racecar. Total overkill.
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Logged
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When in doubt, Whip it out!
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Jim_Lusk
Official BS King
Global Moderator
BBD God
 Offline
Posts: 5262
A-bodies since 1978, this one since 1983
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There is no reason to change what you have to the later combination block. If you add discs to the rear I believe all you have to do is remove the prop valve and leave the original distribution block.
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Logged
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7903 posts on old board.
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440WIP
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Thanks for the input Farmington. I am told that there are indeed "DISTRIBUTION BLOCKS", as you put it, and proportioning valves and they do serve two distinct functions. In laymans terms as I understand it,when brake pressure is applied, the proportioning valve meters pressure so that more pressure is diverted to the front brakes so that they are doing more work than the back brakes so that the vehicle in question does not go into a spin. Distribution blocks strangely enough are both old and new - in that they distributed brake fluid then and now. Apparently newer vehicles use distribution blocks and electronics to do the job now. Can't claim to know how that particular system works as I am not a mechanic by any stretch - thats why I ask questions.
In regards to my second question, last I checked, my Duster was capable of 134 MPH in the 1/4. When I finish installing the 8-71 overtop the stroked 440, I'm thinking 140-145 MPH is going to be probable, so we are on the same page there. I really think something more than stock 8.75" drum brakes are required.
Overkill - probably - but its a good place to overkill. Again, thanks for the input I always appreciate the help.
Thank you for the reply as well Jim.
Daryl
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Logged
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"This big block thing is starting to get expensive"
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