ELECTRONICALLY CONTROLLED HYDRAULIC BRAKE SYSTEM AND METHOD FOR REDUCING WEAR THE BRAKE PADS IN SUCH AN ELECTRONICALLY CONTROLLED HYDRAULIC BRAKE SYSTEM

摘要

A hydraulic brake system 10 equipped for anti-slip control and for active brake interventions has a self -priming pump 38. A pressure retention valve 56 prevents the brake system's low-pressure accumulator 36 and the wheel brakes 16 from being evacuated below atmospheric pressure during a sensitive brake operation. A two- position valve 60, 70, 80, 9 0, 100, 110, 120, 130 deactivates the bias of the pressure retention valve 56 by opening a fluid path from the low-pressure accumulator 36 to the pump 38 when it is desired that the wheel brakes 16 be retracted farther to reduce drag and excessive wear of the brake friction elements.