The dual master cylinder project on my restored ’36 Chevy pickup is nearing completion. A compact dual MC with a 1” bore and left side ports has been acquired. The wide mounting ears have been machined to a much narrower configuration to allow the new MC to mount in the space previously occupied by the original MC, and a mounting bracket has been made of 3/16” steel plate to use the same mounting casting as original. A hybrid pushrod has been made to fit the OEM clevis and the new dual MC. The project is now at the point of plumbing the dual MC to the original front and rear brake lines. Other than making some tight bends and making some double flare terminations to a couple of sticks of new ¼” tubing that should be pretty simple.
Some information on various forums suggests that a proportioning valve and/or residual pressure valves are required with use of a dual MC and other information contradicts that. Since this is a 1” bore MC replacing a 1” bore MC, mounted it the exact same location, it seems that nothing is changed hydraulically except the increased safety of hydraulically isolating the front and rear systems. Front/rear pressure bias is determined by the front and rear wheel cylinder bores and those remain factory original.
My question is do any of you have any actual experience (not “opinions”) in doing this on a Huck brake system that would indicate that a proportioning valve and/or residual pressure valves are required for this conversion?
Thanks!
Last edited by yar; 12/21/2016 10:37 PM.
