Spoon Sports 4-Pot Aluminum Caliper
differing diameters of 42.85 mm and 38.18 mm have been adopted for
the four pistons; specifically, the smaller diameter is used for
the entry of disk rotation; the larger, for the output side. Accordingly,
it has been possible to counteract the self-servo effect, which
occurs when the disk rotates during pad application, and as a result,
the pressure applied to the disk by the pad has been made more uniform.
Also, this improvement enables excellent, stable braking performance
to be assured over long service lives.