Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SB-42-19
Service Bulletin/Repair Instructions
FREIGHTLINER: AN ISSUE WITH THERMAL OVERLOAD ON BENDIX AIR DISC BRAKES WHERE ABS SENSOR WIRES MELTS, BRAKE ACTUATOR FAILS TO PROPERLY OPERATE DUE TO VENT HOLE IN BOTTOM NOT OPENING, CALIPERS COATED WITH RED OR BRIGHT ORANGE DUST AND TAPPED AND/OR GUIDE PIN BOOTS MELTED OR OTHERWISE SHOWS HEAT DAMAGE. *KB
sbu4907
Service Bulletin/Repair Instructions
sbu4907 DEF Gauge Reading Incorrectly
35-8
Service Bulletin/Repair Instructions
FREIGHTLINER: LUBRICATING THE WHEEL BEARING, DRIVE AXLES. *JS
GI-54-44
Service Bulletin/Repair Instructions
FREIGHTLINER: THE CYCLING OF THE WINDSHIELD WIPERS EXHIBITS AN UNINTENDED CYCLE. *PE
SB-35-08
Service Bulletin/Repair Instructions
FREIGHTLINER: INSTRUCTIONS ON HOW TO LUBRICATE THE WHEEL BEARINGS ON A REAR DRIVE AXLE. *RM
SB-42-17
Service Bulletin/Repair Instructions
FREIGHTLINER: AIR MANAGEMENT UNIT (AMU) REPLACEMENT. BEGINNING 4/10, CHASSIS EQUIPPED WITH AIR BRAKES OR HYDRAULIC BRAKES WITH AIR OPTIONS, WILL BE EQUIPPED WITH AN ACCESSORY AIR VALVE ASSEMBLY (AAVA). AAVA WILL TAKE THE PLACE OF THE CURRENT AIR MANAGEMENT UNIT (AMU) USED ON THE CHASSIS. NO MODEL YEARS LISTED. *PE
SB-82-1
Service Bulletin/Repair Instructions
FREIGHTLINER: WIPERS MAY SHUT DOWN WHILE IN LOW SPEED MODE DURING VERY HARD RAIN, SNOW, AND ICE. OPERATOR HAS TO USE HIGH SPEED MODE UNTIL IGNITION SWITCH HAS CYCLED. MODEL YEARS UNKNOWN. *PE
SB-42-16
Service Bulletin/Repair Instructions
FREIGHTLINER: RESERVOIR INTERNAL/EXTERNAL CHECK VALVE. CONTAMINATION IN THE WE/SECONDARY RESERVOIR, P/N 12-15476-000, MAY CAUSE THE INLINE CHECK VALVE TO BECOME CLOGGED OR STUCK CLOSED. THIS CAN RESULT IN INSUFFICIENT AIR BUILDUP. INCLUDES MODEL SCHOOL BUS, SHUTTLE BUS AND S2. NO MODEL YEARS LISTED. *PE