Sean D 31 Report post Posted February 4, 2018 All, About to replace my rear drum brakes with disk. I currently have front disk and while I have my engine out, I am redoing the master cylinder and related brake lines to the below disk/drum distribution/proportioning valve. Question: is the proportioning valve part of this combination block still required when replacing the rear drums with disk? If a proportioning valve is still required would it be better to use an adjustable valve instead of the OEM cigar shaped one? Sean Quote Share this post Link to post Share on other sites
Vicfreg 771 Report post Posted February 5, 2018 I used an adjustable one for my 4 wheel disc brake upgrade. That was recommended by SSBC. Quote Share this post Link to post Share on other sites
Rsanter 152 Report post Posted February 6, 2018 You need to change it with an adjustable one so,you can dial it in Quote Share this post Link to post Share on other sites
ray1970 88 Report post Posted February 6, 2018 Just changed my 1970 Mach 1 rear drums to disk.... SSBC kit. This is a power brake front disk...... rear drum car at birth. I did install a proportioning valve in line but have yet to see the need to adj. it. But its early in the game.. Very happy how they work........11-12 lb. intake vac....motor.. The 408C goes fast so it is good to stop fast.. Quote Share this post Link to post Share on other sites
