SUSPENSION:FRONT:SPRINGS:AIR SUSPENSION:LINES AND FITTINGS
VEHICLE DESCRIPTION: CLASS 8 HEAVY DUTY TRUCKS. THE AIR SUSPENSION CONTROL VALVE SUPPLY LINE WAS NOT PLUMBED THROUGH AN AIR PRESSURE PROTECTION VALVE. IN THE EVENT OF A FAILURE, THERE WOULD BE LOSS OF AIR PRESSURE IN THE 'B' SYSTEM AIR RESERVOIR THAT SUPPLIES AIR PRESSURE FOR THE FRONT STEER AXLE BRAKES.
Remedy: DEALERS WILL INSTALL THE NECESSARY AIR PRESSURE PROTECTION VALVE.
95,013 vehicles affected
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS
THE REAR MOST AXLE OF THE TANDEM AXLE SET COULD HAVE INOPERABLE BRAKES ON ONE OR BOTH WHEELS BECAUSE THE BRAKE S-CAM WAS INCORRECTLY INSTALLED.
Remedy: DEALERS WILL INSPECT THE BRAKE SYSTEM AND REPAIR THE S-CAM ASSEMBLY IF FOUND REVERSED.
149 vehicles affected
SERVICE BRAKES, AIR
THE TRACTION SOLENOID EXHAUST CAN BE OBSTRUCTED DUE TO INADEQUATE DRAINAGE AND A BUILD-UP OF ROAD CONTAMINATION BETWEEN THE MOUNTING BRACKET AND THE SOLENOID HOUSING. THE OBSTRUCTED EXHAUST PREVENTS THE RELAY VALVE CONTROL AIR PRESSURE FROM VENTING AFTER A DIFFERENTIAL BRAKING TRACTION EVENT.
Remedy: DEALERS WILL REMOVE THE SUSPECT VALVE AND INSTALL A NEW VALVE THAT HAS A MODIFIED SOLENOID HOUSING WHICH WILL ALLOW FOR SUFFICIENT DRAINAGE AND A NEW VALVE MOUNTING BRACKET WITH INCREASED HEIGHT TO REDUCE ENTRY OF CONTAMINATION.
771 vehicles affected
SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM
THE REAR SUSPENSION AXLE RETENTION PLATE CAN BREAK UNDER NORMAL USE, AFFECTING AXLE ALIGNMENT.
Remedy: DEALERS WILL REMOVE AND REPLACE THE AXLE RETENTION CLIP PLATES ON AFFECTED VEHICLES.
6,034 vehicles affected
STEERING:LINKAGES:ARM:IDLER AND ATTACHMENT
TWO BOLTS ATTACHING THE UPPER STEERING ARM TO THE FRONT STEERING AXLE WERE NOT TIGHTENED PROPERLY.
Remedy: DEALERS WILL INSTALL NEW BOLTS AND TIGHTEN TO PROPER TORQUE SPECIFICATION.
175 vehicles affected
SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS
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.
Remedy: 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.
4,709 vehicles affected