Recalls for 1994 Mack Dm

DEFECT #1 - SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS

Posted on: 1995-09-27
Description
Air system blockage in the air dryer occurs degrading the moisture removing capabilities of the dryer when the vehicle is operated in a cold environment and moisture accumulates and freezes in the air dryer or in the line between the dryer and the air system reservoir.  The air dryer can become overpressurized causing the air dryer cartridge to separate from the mounting base.

Consequence
If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.

Corrective Action
Dealers will equip air systems with a pressure relief valve to be located between the compressor and the air dryer.  This pressure relief valve is intended to vent if excessive pressure develops in the air dryer.

Notes
System: brakes; air dryer.  Vehicle description: heavy duty class 8 trucks equipped with rockwell wabco system saver 1000 or system saver twin air dryer.  Note: if your vehicle is presented to an authorized dealer on an agreed upon service date and the remedy is not provided free of charge within a reasonable time, contact mack at 1-610-709-3011.also contact the national highwaytraffic safety administration's auto safety hotline at 1-800-424-9393.