NHTSA Complaint #11110399 — 2017 KENWORTH T680

DRIVER DRIVING DOWN ROAD IN ILLIONOIS RIGHT FRONT DRIVE AXLE WHEEL END BRAKES STARTED SMOKING WHEN BRAKE NOT DEPRESSED, DRIVER STOPPED FOUND BOTH TIRES IN TACT AND FULLY INFLATED THEN TIRES STARTED ON FIRE WHILE PARKED AND COULD NOT BE EXTINGUISHED TOTAL LOSS OF TRUCK TRAILER AND LOAD, CALLED IN FIRE TEAM DETERMINED HALDEX BRAKE CHAMBER ON RIGHT REAR FAILED AND CAUSE THE LOSS OF AIR PRESSURE IN THE BRAKING SYSTEM BRAKE DRUMS SHOWED EXTREME HEAT DURING THE INSPECTION RESULTING IN THE FIRE, JOINT INSPECTION WITH HALDEX REVELED KNOWN ISSUES WITH THE BRAKE CHAMBER SPRING , BRAKE CHAMBER WAS DISARMED FOR INSPECTION AND WAS FOUND THE SPRING HAD BROKEN AND PUNCTURED THE DIAPHRAM CAUSING THE LOSS OF AIR PRESSURE AND UNCONTROLLABLE BRAKE APPLICATION WHILE DRIVING AT HYWAY SPEEDS, BROKEN PARKING SPRINGS IN THE HALDEX GOLD CHAMBER WITH NO KNOWN FIX