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NHTSA Campaign 77V013000

SERVICE BRAKES, AIR:DRUM

Issued by MACK TRUCKS, INCORPORATED · Reported Jan 1, 1977 · 830 vehicles affected

What's wrong

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.

Vehicles affected by this recall

Make Model Year Units
MACK WL 1975 830
MACK WL 1976 830
MACK WS 1975 830
MACK WS 1976 830

Source: NHTSA Campaign 77V013000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.