15/16" MC with 2.75" calipers any problems with stopping ?

Dana67Dart said
Fyi the area of the 4 pistons in 1 KH is about 8.4 sq in and your single 2.75 caliper is about 5.9 sq in.

15/16 piston area is about 3
1 inch piston is about 3.14
1 1/32 inch piston Is about 3.25

Simple math can get you the respective ratios for the combonations.

Then measure you brake pedal and get its ratio

A little more math and you can get final ratio.

You don't count the opposed pistons the same way in brake calculations as you do with a sliding caliper. Since it's clamping on both sides of the rotor but moving half as much it's going to basically half that. The single 2.75 piston is acting on both pads simultaneously.