1975 Mack Ws Recalls, Complaints & Specs

13 safety recalls list the 1975 Mack Ws. Check your own VIN below.

• 1972
• 1973
• 1974
• 1975
• 1976
• 1977
• 1978
• 1979
• 1980
• 1981
• 1983
• 1984

13 safety recalls for the 1975 Mack Ws

Most recent first. Recall repairs are free at any authorised dealer. Click a recall for the full defect, consequence and remedy text.

1. Engine (engine and engine cooling)

   NHTSA 78V170000 Reported August 8, 1978 850 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The possibility exists that the aluminum engine rear support brackets may fail due to metal fatigue. This type of failure would allow the engine and transmission assembly to dislocate downward. This will result in throttle control loss with the engine operating continuously in the mid to upper range of the governed speed range.

   Remedy: Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.

2. Service brakes, air: control unit/module

   NHTSA 78V068000 Reported April 4, 1978 9,700 vehicles potentially affected MACK TRUCKS, INCORPORATED

   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.

   Remedy: The dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.

3. Hoses, lines/piping, and fittings (service brakes)

   NHTSA 78V030000 Reported February 9, 1978 400 vehicles potentially affected MACK TRUCKS, INCORPORATED

   A design deficiency exists in the air dryer piping in the area of the pressure relief valve and compressor governor control link. Moisture is passed and builds up in this relief valve and control line. In freezing ambient temperatures, this moisture may freeze, allowing the chassis air system pressure to exceed 150 PSI. Excessive air…

   Remedy: The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.

4. Fan (engine and engine cooling)

   NHTSA 77V173000 Reported October 12, 1977 48,000 vehicles potentially affected MACK TRUCKS, INCORPORATED

   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.

   Remedy: Dealer will replace the original fan with a steel fixed blade fan, free of charge.

5. Gear box (other than rack and pinion) (steering)

   NHTSA 77V011000 Reported January 1, 1977 2,200 vehicles potentially affected MACK TRUCKS, INCORPORATED

   The lower steering shaft yoke clamp bolts on the involved vehicles may not have been sufficiently tightened. Should these bolts lossen and come off, the lower steering shaft could separate from the steering gear.

   Remedy: The dealer will secure the clamp bolt and make the necessary modifications on the lower steering shaft, free of charge.

6. Drum (service brakes)

   NHTSA 77V013000 Reported January 1, 1977 830 vehicles potentially affected MACK TRUCKS, INCORPORATED

   Cracks may be present in the brake spider. These cracks could eventually cause the brake spider to fail. This could allow separation of that portion of the brake spider that retains the brake camshaft, the brake chamber, and the brake chamber bracket from the foundation brake assembly. Brake pull in the direction opposite the affected…

   Remedy: The dealer will inspect and modify the affected brake spiders, free of charge.

7. Chamber (service brakes)

   NHTSA 76V083000 Reported June 9, 1976 404 vehicles potentially affected MACK TRUCKS, INCORPORATED

8. Steering wheel/handle bar (steering)

   NHTSA 76V060000 Reported April 20, 1976 608 vehicles potentially affected MACK TRUCKS, INCORPORATED

9. Motor (visibility)

   NHTSA 76V005000 Reported January 13, 1976 790 vehicles potentially affected MACK TRUCKS, INCORPORATED

10. Wheel speed sensor (service brakes)

    NHTSA 76V006000 Reported January 13, 1976 350 vehicles potentially affected MACK TRUCKS, INCORPORATED

11. Hoses, lines/piping, and fittings (service brakes)

    NHTSA 75V139000 Reported July 24, 1975 110 vehicles potentially affected MACK TRUCKS, INCORPORATED

12. Steering wheel/handle bar (steering)

    NHTSA 75V140000 Reported July 24, 1975 402 vehicles potentially affected MACK TRUCKS, INCORPORATED

13. Check valve (service brakes)

    NHTSA 75V141000 Reported July 24, 1975 935 vehicles potentially affected MACK TRUCKS, INCORPORATED

No owner complaints on file

NHTSA has no owner complaints on file for the 1975 Mack Ws. For context, the average model year in NHTSA's database has dozens; a zero can mean a reliable vehicle, a rare one, or both.

Compare Mack Ws model years

Recall and complaint counts for every Mack Ws model year in NHTSA's database.

Checking a specific 1975 Mack Ws

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Source: NHTSA recall and complaint databases and EPA fuel economy data, October 2026. Complaint counts are owner reports to NHTSA, not verified defects. Recall counts are safety campaigns that list this model year; whether a particular car was already repaired depends on its VIN. How this data is compiled.