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NHTSA Campaign 85V113000

SERVICE BRAKES, AIR

Issued by MACK TRUCKS, INCORPORATED · Reported Sep 17, 1985 · 5,020 vehicles affected

What's wrong

THE DUAL DOUBLE CHECK VALVE MAY NOT RELEASE THE PROPER AIR VOLUME TO THE BRAKE SYSTEM, CAUSING A SLIGHT TIMING DELAY BETWEEN THE TRACTOR AND THE TRAILER BRAKE SYSTEM. CONSEQUENCES OF DEFECT: IF THE BRAKES ARE SUDDENLY APPLIED, THE TRAILER COULD JACKKNIFE WITHOUT WARNING TO THE OPERATOR, WHICH COULD RESULT IN A VEHICLE CRASH.

Remedy

INSTALL TWO NEW SLEEVES IN THE DUAL DOUBLE CHECK VALVE WHICH WILL INCREASE AIR FLOW.

Vehicles affected by this recall

Make Model Year Units
MACK MH 1982 5,020
MACK MH 1983 5,020
MACK MH 1984 5,020
MACK MH 1985 5,020

Source: NHTSA Campaign 85V113000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.