The 1975 Mack R has 6 NHTSA recall campaigns affecting an estimated 95,354 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
AN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.
THE DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE ANTI-WHEEL LOCK CONTROLLER WITHOUT CHARGE TO OWNER.
THE TEE BRACKET, WHICH IS MOUNTED ON THE FRONT AXLE OF THE BOGIE, MAY FAIL DUE TO VIBRATION BROUGHT ON BY ROAD SURFACE IRREGULARITIES. BRACKET FAILURE WOULD LEAVE THE TEE BRACKET UNSUPPORTED AND CAUSE BROKEN HOSE CONNECTOR FITTINGS. THIS WOULD RESULT IN AUTOMATIC APPLICATION OF THE SPRING EMERGENCY BRAKES.
THE DEALER WILL REPLACE THE DEFECTIVE BRACKET WITH A REDESIGNED VERSION.
THE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.
DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.
MACK CAMPAIGN NO SC071.TRUCKS EQUIPPED WITH SWTL-56 SERIES REAR AXLE.POSSIBILITY THAT THE REAR SUSPENSION WAS ASSEMBLED WITH AN INCORRECT TRUNNIONTHAT HAS A RADIUSED SPRING SEAT, CREATING A LINE OF CONTACT BETWEEN THE SPRINGSEAT AND THE SPRING ITSELF, SUBJECTING THESE COMPONENTS TO HIGH STRESSCONCENTRATIONS.IF THIS…
MACK CAMPAIGN NO Q1010.TRUCKS SEPT.1974 THRU JULY 17, 1975.POSSIBILITYTHAT THE POWER AND WARNING LIGHT LEAD FROM THE ANTI-WHEEL LOCK CONTROLLER FORTHE STEERING AXLE MAY HAVE BEEN INADVERTENTLY CONNECTED INCORRECTLY TO A WHEELSENSOR CABLE.IF THIS OCCURS,THE CONTROLLER ON THE STEERING AXLE WOULD NOT BEPOWERED NOR WOULD…
MACK CAMPAIGN NO N/A.TRUCKS WITH DUAL BRAKE TREADLE VALVE PIPING SEPT.1974AND MAR.31, 1975.POSSIBILITY THAT THE PRIMARY AND SECONDARY AIR SUPPLYLINES MAY HAVE BEEN CONNECTED IN REVERSE AT THE DUAL BRAKE TREADLE VALVE.THEREVERSING OF THESE SUPPLY LINES DOES NOT IN ITSELF, AFFECT VEHICLE BRAKING IFBOTH THE PRIMARY AND…
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1975 Mack R as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.