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1975 Mack WS recalls

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

13 recalls found in NHTSA data as of September 22, 2026

For the 1975 Mack WS. These apply to the model and year, not to one particular vehicle: check your VIN to see whether yours is included and whether it has been repaired.

Has your Mack been repaired?

Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.

NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.

1975 Mack WS recalls, newest first

August 8, 1978NHTSA 78V170000850 vehicles potentially affected

Engine and engine cooling › Engine

Summary
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.

This recall on nhtsa.gov

April 4, 1978NHTSA 78V0680009,700 vehicles potentially affected

Service brakes, air › Antilock › Control unit/module

Summary
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.

This recall on nhtsa.gov

February 9, 1978NHTSA 78V030000400 vehicles potentially affected

Service brakes, air › Supply › Hoses, lines/piping, and fittings

Summary
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 system pressure can cause separation of air piping connections and air system valve failure.
Remedy
The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.

This recall on nhtsa.gov

October 12, 1977NHTSA 77V17300048,000 vehicles potentially affected

Engine and engine cooling › Cooling system › Fan

Summary
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.

This recall on nhtsa.gov

January 1, 1977NHTSA 77V013000830 vehicles potentially affected

Service brakes, air › Drum

Summary
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 wheel location or wheel lock-up on the affected wheel could occur.
Remedy
The dealer will inspect and modify the affected brake spiders, free of charge.

This recall on nhtsa.gov

January 1, 1977NHTSA 77V0110002,200 vehicles potentially affected

Steering › Gear box (other than rack and pinion)

Summary
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.

This recall on nhtsa.gov

Owner complaints

No owner complaints about the 1975 Mack WS were found in NHTSA’s complaint data.

Other Mack WS years

Other 1975 Mack models

Questions

Does the 1975 Mack WS have any recalls?
13 recalls found in NHTSA data as of September 22, 2026, covering: engine and engine cooling, service brakes, air, steering, visibility. Recalls apply to the model and year; whether a particular vehicle is included, and whether it has been repaired, depends on its VIN.
How do I check if my 1975 Mack WS recall has been fixed?
Enter your 17-character VIN at nhtsa.gov/recalls, or ask a Mack dealer. Recall repairs are free. NHTSA's VIN search doesn't list recalls that were already repaired.
How many complaints have owners filed about the 1975 Mack WS?
0 complaints filed with NHTSA. Complaints are unverified reports from the public that NHTSA uses to decide what to investigate.