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Old 11-07-2009, 06:23 PM
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Disc brake convertion 72 chevelle

Hi im doing a disc brake conversion on my 1972 chevelle all the parts are all together but the thing im having problems with is the proportion valve or dist block.I called in line tubes and the recommended that i get rid of my factory drum drum dist block and go with a proportion valve well when i received the new p valve first thing i noticed was that all the treaded ports are all to big there is no way my brake lines would be able to hook up to this block.Im not sure what to do return the part and order a dist block for disc drum or just get my $120.00 back and hit a junk yard.Does anyone have any idea on what i need will the dist block for disc drum work just as good as the proportion valve.I don't want to have to cut any lines and change the fittings to make this p valve work if i don't have to i just want something that will just hook up to the brake lines that i have is is the only thing that keeping me from finishing this project HELP!!!!!!!!!!!!!!!

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Old 11-07-2009, 07:07 PM
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If you want to use what you have bought, Just go get some fittings with a male end that will fit in (screw in) the over size port and on the other end a female size that will fit your existing lines So then they will screw into it. Adapt down.JMO.......Cole
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Old 11-09-2009, 01:53 PM
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First of all, GM used oddball thread sizes on these fittings to prevent misconnections on the assembly line (and to prevent using a disc brake combo valve on a drum brake car). As noted, you can get adapters for these threads. Be sure they are male flare to female flare - do NOT use NPT adapters.

Your other choice would have been to keep the drum brake distribution block and use a separate proportioning valve. This is how GM did it on the 67-70 disc brake cars. The change to the combo valve was only done to save cost on the assembly line. Otherwise, the combo or separate prop valve work exactly the same.
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Old 11-13-2009, 08:24 PM
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Quote:
Originally Posted by chevy power 1972
Hi im doing a disc brake conversion on my 1972 chevelle all the parts are all together but the thing im having problems with is the proportion valve or dist block.I called in line tubes and the recommended that i get rid of my factory drum drum dist block and go with a proportion valve well when i received the new p valve first thing i noticed was that all the treaded ports are all to big there is no way my brake lines would be able to hook up to this block.Im not sure what to do return the part and order a dist block for disc drum or just get my $120.00 back and hit a junk yard.Does anyone have any idea on what i need will the dist block for disc drum work just as good as the proportion valve.I don't want to have to cut any lines and change the fittings to make this p valve work if i don't have to i just want something that will just hook up to the brake lines that i have is is the only thing that keeping me from finishing this project HELP!!!!!!!!!!!!!!!
Hi guys, Im a newbie. Nice to join this forum.

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