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Humble, The #20/26 can't be the piston sizes as the larger one would have to be at the pedal end! If the caliper piston sizes were smaller at the rear then it would have been more likely that the m/c would have the same bore size for front and rear circuit since the bias will have been controlled by the caliper sizing. It would be unusual for the manufacturer to have controlled it by both the caliper and the m/c (late 944 excepted). The 23.8mm (15/16") bore size does imply a power assisted pedal as it is quite large for non-servo assistance, which are generally </=19mm
Clive
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