There are 9 owner-reported brakes complaints for the 2003 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
LEFT REAR EMERGENCY BRAKE HARDWARE MALFUNCTIONED WHILE BACKING THE VEHICLE REARWARD IN THE DRIVEWAY. THE EMERGENCY BRAKE WAS OFF AT THE TIME INCIDENT OCCURRED. HAD EMERGENCY BRAKES REPAIRED ON JANUARY 26, 2017.
DT*: ON THREE OCCASIONS WHEN THE GEAR WAS PLACED INTO DRIVE THE VEHICLE WOULD LURCH FORWARD OR WHEN THE BRAKES WERE APPLIED THE SAME THING WOULD OCCUR CAUSING THE TIRES TO SCREECH. THE VEHICLE WAS TAKEN TO DEALERS WHO DETERMINED THAT THE GAS AND BRAKE PEDALS WERE TO CLOSE TO EACH OTHER. WHEN DEPRESSING ONE PEDAL THE OTHER PEDAL WAS ALSO APPLIED. THE DEALERS ALSO DETERMINED THAT BECAUSE THE PEDALS WERE IN CLOSE PROXIMITY IT WOULD CAUSE THE VEHICLE TO UNINTENTIONALLY ACCELERATE. THE DEALERS CONTACTED THE MANUFACTURER WHO CONFIRMED THAT THERE WERE NO RECALLS ON THIS ISSUE. UPDATED 7/14/2006 - *NM
DT*: THE CONTACT STATED WHILE ATTEMPTING TO APPLY BRAKE PRESSURE THE VEHICLE ACCELERATED. THE DEALERSHIP WAS ALERTED HOWEVER NO REPAIRS HAVE BEEN MADE. THE CONSUMER BELIEVED THE BRAKE AND ACCELERATOR WERE DESIGNED TOO CLOSE TOGETHER. UPDATED 04/06/06. *JB
BRAKE PEDAL AND GAS PEDAL ARE TOO CLOSELY LOCATED. WHEN STEPPING ON BRAKE PEDAL CONSUMER CAN HIT THE GAS PEDAL AT THE SAME TIME. *AK
ACCELERATOR PEDAL AND BRAKE PEDAL ARE LOCATED TOO CLOSE TOGETHER. THIS WOULD CAUSE A MISAPPLICATION TO THE WRONG PEDAL WHEN BRAKING OR ACCELERATING, AT THE SAME TIME. HAD TAKEN VEHICLE TO DEALERSHIP, AND MECHANIC COULD NOT RESOLVE THE PROBLEM.*AK
WHILE DRIVING IN BUMPER TO BUMPER TRAFFIC, THE VEHICLE'S BRAKES FAILED. THE PEDAL WAS EXTREMELY HARD TO PRESS WHICH RESULTED IN A REAR END COLLISION. *NLM SUSPECTED THE BRAKE/GAS PEDAL RAISED TO THE SAME LEVEL WHEN SWITCH WAS ACTIVATED, POSSIBLE DEPRESSING BRAKE AND GAS AT THE SAME TIME. (CALIFORNIAHIGHWAY PATROL) *SCC
NAR 05/21/2003 *MR WITH LESS THAN 250 MILES THE CONSUMER BRAKE PEDAL SLOWLY SANK TO THE FLOOR. THE CONSUMER IS REQUESTING FORD MOTOR COMPANY RECALL THE VEHICLE AND FIX THE BRAKE PROBLEM. *CB
WHILE WAITING FOR RED THE LIGHT TO CHANGE, THE VEHICLE SUDDENLY ACCELERATED. THE DRIVER COULD NOT MAINTAIN CONTROL, THE VEHICLE JUMPED THE CURB AND CRASHED INTO A DITCH. *AK THERE WAS NO DIAGNOSTIC TEST PERFORMED ON THE VEHICLE. THE AIR BAG DID NOT DEPLOY, THE ELECTRONIC FUEL SHUT OFF AND DID NOT ENGAGE AND THE SEAT BELTS DID NOT TIGHTEN. THE CONSUMER WAS TOLD THAT THE ADJUSTABLE PEDALS CAUSED THE ACCIDENT AND HAVE CAUSED A LOT OF ACCIDENTS. FORD CLAIMED THAT FAULT IS THE DRIVER'S FAULT DUE TO THEIR FOOT BEING ON BOTH PEDALS AT THE SAME TIME. *SCC *JB
CONSUMER STATED THE ACCELERATOR WOULD STICK ON OCCASIONS, ALSO WHEN THE BRAKE WAS APPLIED THE VEHICLE FAILED TO STOP. TS *JB
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026