One problem related to brake master cylinder has been reported for the 2002 Mercury Mountaineer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Mercury Mountaineer based on all problems reported for the 2002 Mountaineer.
Changed front pads ( never opened bleeder)then had soft pedal, after that changed frond brake lines master cylinder, booster, abs control unit and calipers still soft pedal. Then used snapon scan tool to perform brake bleeding in abs control unit, still problem persisted, as of now still no luck (bleeding all 4wheels in factory specs have been perform/bench bleeding) still soft pedal.