Im convinced there is so much bullshit with these companies Right stuff is a joke

J.B. said

There are two master cylinder power kits the master cylinder bore set i have is 1-1/16” bore or the other is 15/16” bore. I have large bore and rod version dont see why that doesnt work someone said i have a drum master cylinder so not sure ehat to believe is going on here

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I suspect that comment was made because of the 2 different sized reservoirs on your master. Disk brakes use more fluid as it fills the caliper piston cavity as the pads wear down (master level drops). That's why that reservoir is larger. When guys add rear disks from a doner vehicle (Jeep for example) they typically use the same master, but remove the residual valve from the port of the master that feeds the rear brakes. If that is left in, I believe that the new rear calipers either don't release, or release slowly. A new proportioning valve (maybe adjustable) is added to balance out the braking percentages between the front and rear because of the new disks.

I would expect that the master that you received in your kit contains no residual valve for the rear brakes, so you should be good there. Just keep an eye on the fluid level in the small chamber over time as the brakes wear.