One problem related to brake disc has been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
Front disc brakes squeaked and squealed excessively since the original purchase of the vehicle. Returned vehicle several times to dealer to correct problem. Dealer replaced front pads and turned rotors. Replacement pads were Ford motorcraft pads. Braking power was noticeably reduced immediately after the Ford motorcraft pads were installed. After another trip to the dealer, Ford oem pads were installed. Braking power was restored to normal (original) levels, and the squeaking / squealing was gone. My concern is that Ford motorcraft parts are not the equivalent to the oem parts, and that dealers throughout the country are being shipped, and instructed to use Ford motorcraft disc pads which clearly are creating a dangerous condition. Mr.