One problem related to brakes failed has been reported for the 2003 Mercury Marquis. The most recently reported issues are listed below.
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. 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).
| Brake Pedal And Linkage problems | |
| Brakes Failed problems | |
| Service Brakes problems |