Kelsey Hayes 4 piston discs

Oklacarcollecto said

If your system is in good shape the 15/16" master should be working great. I have never used anything but the 15/16" with my Kelsey Hayes brakes. If you have a system that has pistons hanging up, no master cylinder will correct the problem.

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That's why I am replacing the calibers, rotors, and pads first. Once I do that then Ill decide if i want to go to a dual chamber master cylinder instead of the oem single. If I say something incorrectly please correct me because I am still learning.