An electronic parking brake system having selectable modes and varying parking brake actuation dependent on the selected mode and amount of parking brake application being requested. The working hydraulics have a variable delivery pump connected to the driving engine. At least one tape insert is mounted within at least one of the circular passageways, wherein the tape insert longitudinally bisects the circular passageway and further wherein edges of the tape insert abut cylindrical wall. Means are provided for pivoting the hub between loaded and unloaded limiting positions about an axis parallel to but spaced from the hub’s principal axis.