BRAKE BOOSTER REAR SHELLS MAY HAVE REDUCED WALL THICKNESSES WHICH COULD CAUSE THE SHELL TO BREAK.
INSPECT AND IF NECESSARY REPLACE THE POWER BRAKE BOOSTER ASSEMBLY.
The 1985 Mercury Marquis Service and Repair Manual is a practical, workshop-ready reference for maintenance, diagnostics, and repairs. Use it to troubleshoot symptoms, follow step-by-step procedures, verify specifications, and confirm wiring and connector locations before replacing parts.
Ideal for technicians and DIY owners, it supports everything from routine service to deeper mechanical and electrical work—including drivability, no-start, warning lights, overheating, brake and suspension issues, HVAC faults, and circuit testing.
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BRAKE BOOSTER REAR SHELLS MAY HAVE REDUCED WALL THICKNESSES WHICH COULD CAUSE THE SHELL TO BREAK.
INSPECT AND IF NECESSARY REPLACE THE POWER BRAKE BOOSTER ASSEMBLY.
INFORMATION ON IDENTIFYING NON-APPROVED / ALTERNATE REFRIGERANTS WHICH COULD CAUSE SAFETY, AND PERFORMANCE CONCERNS IF INSTALLED IN FORD A/C SYSTEMS. *TT
WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS. *TW
WINDSHIELD AND INTERIOR GLASS - FOG/FILM. *TW
TRANSAXLE - TORQUE CONVERTER REPLACEMENT GUIDELINES AND TORQUE CONVERTER/TRANSAXLE COOLING SYSTEM CLEANING PROCEDURES - SERVICE TIP. *TW
PE 00 020/TIRE TREAD SEPARATION: RIGHT REAR TIRE EXPERIENCED A TREAD SEPARATION (TIRE WAS STILL INFLATED) WHILE TRAVELING AT 40 MPH, WITH DRIVER AND THREE PASSENGERSIN A 1985 MERCURY, MARQUIS, AFTERMA
THIS CAR HAS HAD THREE TRANSMISSION PUT IN IT THAT I KNOW OF AND SOMETHING IS STILL A WRONG WITH IT. THIS CAR HAS OTHER PROBLEM'S TO NUMEROUS TO MENTION,LIKE AIR CONDITIONER, DOOR LATCHES , REAR END A
WHILE DRIVING THE VEHICLE CAME TO A STOP AND THE VEHICLE STALLED AND SHUT OFF. THIS HAPPENS ALL THE TIME WHEN COMING TO A STOP. ONCE IT STALLS VEHICLE SHUTS OFF, VEHICLE WILL START BACK UP . INVESTIG
WHILE DRIVING THE VEHICLE CAME TO A STOP AND THE VEHICLE STALLED AND SHUT OFF. THIS HAPPENS ALL THE TIME WHEN COMING TO A STOP. ONCE IT STALLS VEHICLE SHUTS OFF, VEHICLE WILL START BACK UP . INVESTIG
GOING UP RAMP, ENGINE LIGHT ON, MAKING LOUD NOISE, ENGINE SURGED FORWARD QUICKLY, APPLIED BRAKES TO REDUCE SPEED, GOING UP HILL, ENGINE RACED AHEAD. DID NOT TAKE TO DEALER. *AK
Showing the 5 most serious of 6 complaints filed with NHTSA.
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