I just did this on my 68 about a month ago in the cold and snow... pretty simple. I wouldn't see a problem in using a junk yard prop valve if you can find one with a sealed brake system. Everyone I found was full of crude and rusty looking on the inside so I went with the adjustable unit.
----- Original Message -----
From: Gary W. Treible
Sent: Friday, January 30, 2004 3:03 PM
To: The Chevelle Mailing List
Subject: Re: [Chevelle-list] disk brake conversion
Yes, that's true. I just got in the bad habit of referring to it generically as a "proportioning valve". In my car the distribution block (see I'm improving already) was machined out of a solid block of steel. The proportioning valve is a casting. The size difference also means the hard lines land in slightly different places, as I recall.
I used the junk yard proportioning valve. Not knowing exactly what's inside, that may have been foolish. I've never heard of one going bad though.
Gary
----- Original Message -----
Sent: Friday, January 30, 2004 3:48 PM
Subject: RE: [Chevelle-list] disk brake conversion
Drum cars donât have a proportioning valve. Just a distribution block.
John Nasta
-----Original Message-----
Will I need a new proportioning valve? And if so does it have to be adjustable?
My understanding is "yes". If you had just added the booster, but left the four wheel drums, you would leave the proportioning valve alone, but it's the change in brake typr (drum to caliper) that causes the need for the proportioning valve. If your using all real Chevelle parts, I don't see the need for adjustability. If you were building a street rod using speciality parts, you would want the adjustable one
