4 Wheel disc, soft pedal

DoctorDiff said

Are you running GM front calipers on the rear? If so, what is the bore size?

Unless you have special, small bore circle track GM Metric calipers, you will end up with a soft pedal when paired with a 15/16" bore master cylinder.

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Yes, kit uses the GM front calipers as rears.

Car is on the floor currently so I'll need to verify later today, but I looked up the kit I bought, got the caliper p/n and did some digging. 2.5" is the bore size according to the almighty Google.