After more googling stimulated by kmoney's post, there are 2 types of disk brake calipers:
Fixed and
sliding or floating calipers.
This young man in this
youtube video explains how each type works.
All CB1100 models have a single pot (piston)
floating or sliding caliper on the rear wheel.
All CB1100 models without abs have 4 pot
fixed front caliper brakes.
The 2014 DLX/EX with abs have 4-pot
fixed calipers on the front wheel.
the 2013 with Combined-ABS have 3-pot
floating/sliding calipers on the front wheel. The center piston on the right front is linked to the rear brake master cylinder so when you apply the rear brake, the center piston on the right front caliper is engaged to allow some braking power to the front wheel. This explains why there are 2 brake lines and 2 bleed valves on the right front caliper on this model. See use2b's picture above.
My 2008 ST1300 has 3-pot
floating/sliding calipers on both the front a rear wheel presumably because the front brakes are linked to the rear center piston and the rear brakes are linked to the right front center piston.