EMERGENCY PARKING BRAKE ('EPB') BEGAN TO MALFUNCTION FOLLOWING RECALL TO FIX ELECTRICAL COMPONENTS ON MAZDA CX-9, 2018. EPB WILL NOT RELEASE, OR WILL UNEXPECTEDLY AND SUDDENLY RELEASE WITH CAR ACCELERATING IN GEAR ('DRIVE' OR 'REVERSE'). MOST RECENTLY WHEN ACTIVATING THE EMERGENCY PARKING BRAKE ((CAR WAS ON A A ROADWAY INCLINE) THE BRAKE WOULD NOT RELEASE, AFTER 2 HOURS OF BEING STRANDED AND OF ATTEMPTING TO GET THE BRAKE TO RELEASE, ( INCLUDING ROCKING/SHIFTING/ALTERNATING GEARS/BRAKING/SEAT BELT ON/SEAT BELT OFF/ MANUAL BRAKE ON/OFF AND FOLLOWING ALL MANUAL PROCEDURES REPETITIVELY) A CELL PHONE CALL TO THE MAZDA SERVICE MANAGER WHO SUGGESTED ROCKING THE CAR BACK AND FORTH BETWEEN GEARS ) THE EMERGENCY PARKING BRAKE SUDDENLY AND UNEXPECTEDLY 'RELEASED', SENDING THE CAR LURCHING FORWARD AND REQUIRING DRIVER TO SLAM ON BRAKES TO AVOID DRIVING OVER A CLIFF). VEHICLE EPB INSPECTION REQUESTED, MAZDA SERVICE MANAGER STATED THE EPB IS, 'NO LONGER NECESSARY FOR VEHICLE SAFETY', BLAMED THE MALFUNCTION ON 'BREAD CRUMBS' , OFFERED TO REPLACE A DEFECTIVE CONSOLE SWITCH (PRESUMABLY WITH ANOTHER NEW, BUT ALSO DEFECTIVE, SWITCH) BUT REFUSED TO INSPECT THE MECHANICAL/OPERATIONAL ASPECTS OF THE AUTOMATIC EMERGENCY PARKING BRAKE SYSTEM (FOR ABNORMAL RUST, WATER LEAKS, DEFECTIVE CABLES, DEFECTIVE ELECTRICAL WIRING, ETC.). MAZDA USES THE SAME MANUFACTURER OF EPB FOR ALL MAZDA CX SERIES VEHICLES. FEDERAL NHSA RECALLS FOR EPB MALFUNCTIONS WERE MANDATED FOR ALL MAZDA CX SERIES VEHICLES - EXCEPT