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Mack MH Recall 85V113: Service Brakes, Air

NHTSA campaign 85V113, reported September 17, 1985, 5,020 vehicles potentially affected.

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The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 85V113MACK TRUCKS, INCORPORATED
Component
SERVICE BRAKES, AIR
Problem
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.
Risk
Remedy
INSTALL TWO NEW SLEEVES IN THE DUAL DOUBLE CHECK VALVE WHICH WILL INCREASE AIR FLOW.
Notes
VEHICLE DESCRIPTION: HEAVY DUTY TRACTOR TRAILER COMBINATIONS. SYSTEM: BRAKES, TRACTOR TO TRAILER.

Affected vehicles

Mack MH1982198319841985