MACK MH 1984: SERVICE BRAKES, AIR

Make : MACK Model : MH Year : 1984
Build Dates : 1982-01-01 - 1984-12-01
NHTSA CAMPAIGN ID Number : 85V113000
Date Owner's Notified: 1986-02-07 Date Received by ODI: 1985-09-17 Date Added to Database: 1985-09-24
Manufacturers Involved: Mack Trucks, Inc.
Manufacturer's Responsible for the Recall:
Manufacturer Campaign Number:
Component: SERVICE BRAKES, AIR
Potential Number Of Units Affected : 5020
Summary:
      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.
Consequence:
     
Remedy:
      INSTALL TWO NEW SLEEVES IN THE DUAL DOUBLE CHECK VALVE WHICH WILL INCREASE AIR FLOW.
Report Initiator: MFR V Report
Regulation Part Number: Federal Motor Vehicle Safety Standard Number:
Notes:
      VEHICLE DESCRIPTION: HEAVY DUTY TRACTOR TRAILER COMBINATIONS. SYSTEM: BRAKES, TRACTOR TO TRAILER.